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Grammatical Structure

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Question 701Question →

Every one of the regional representatives who attended the annual agricultural summit _____ expected to submit a detailed report to the ministry. Which verb form correctly completes the sentence?

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Answer: is

Answer

The correct option is the singular verb 'is'.
The sentence requires a singular verb because the head subject is the singular indefinite pronoun 'Every one'. The intervening plural noun phrase ('of the regional representatives') and the relative clause ('who attended the annual agricultural summit') modify the subject but do not change its singular grammatical number. Therefore, the singular verb 'is' is the only grammatically accurate selection.

Step-by-Step Solution

1
Identify the true head subject of the main clause.
The head noun phrase is 'Every one of the regional representatives'. Within this phrase, 'Every one' is the singular indefinite pronoun head.
Prepositional phrases like 'of the regional representatives' and relative clauses like 'who attended...' act as modifiers and do not alter the number of the head subject.
2
Apply the rule of concord for indefinite pronouns.
Indefinite pronouns such as 'every one', 'each', 'everyone', and 'nobody' take a singular verb.
Grammatical concord requires agreement in number between the subject and the verb.
3
Select the correct singular verb form.
The singular auxiliary verb 'is' agrees properly with 'Every one'.
Plural forms ('are', 'were', 'have been') incorrectly agree with plural modifier nouns rather than the head subject.

Key Concept

Indefinite Pronoun Concord and Error of Proximity
Question 702Question →

In the sentence below, supply the auxiliary verb form that correctly satisfies the rules of grammatical concord for each blank.

Fill in the blanks below

Three-quarters of the damaged agricultural yield already been discarded, while more than one local farmer appealed for emergency subsidies.
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Answer

The correct auxiliary verb for both blanks is 'has'.
For the first blank, 'Three-quarters of' is followed by the singular uncountable noun 'yield', requiring the singular auxiliary verb 'has'. For the second blank, the noun phrase 'more than one local farmer' follows the standard rule of formal concord where 'more than one' plus a singular noun demands a singular verb ('has').

Step-by-Step Solution

1
Analyze the subject structure for the first blank: 'Three-quarters of the damaged agricultural yield'.
The noun following the fraction 'Three-quarters of' is 'yield', which is an uncountable singular noun.
When a fraction or percentage modifies an uncountable or singular noun, the verb must be singular ('has').
2
Analyze the subject structure for the second blank: 'more than one local farmer'.
The subject uses the fixed grammatical expression 'more than one' followed by a singular countable noun ('farmer').
By the rule of formal concord in Standard English, the structure 'more than one + singular noun' strictly requires a singular verb ('has'), regardless of the plural implied meaning.

Key Concept

Fractional Concord and 'More Than One' Concord Rule
Estimated Time:1m 30s
Question 703Question →

Complete the sentence below by supplying the correct form of the modifier in the blank space.

Fill in the blanks below

Before the committee adjourned the session, the chairperson announced that no investigation into the financial breach would be conducted without direct authorization.
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Answer

The correct modifier to complete the sentence is 'further'.
The modifier 'further' correctly functions as an adjective meaning 'additional' or 'beyond what exists'. Because an investigation is a process rather than a physical distance, 'further' is the grammatically appropriate choice.

Step-by-Step Solution

1
Analyze the context of the sentence to determine the required sense of the modifier.
The sentence refers to additional or extra inquiry into a financial breach, rather than measurable spatial distance.
The choice between comparative modifiers like 'further' and 'farther' depends on whether the modification indicates figurative extension/addition or literal physical distance.
2
Apply the grammatical rule governing modifier usage for non-physical concepts.
'Further' is the correct adjective form signifying 'additional' or 'more advanced in degree'.
An investigation is an abstract process, so the quantitative/figurative modifier 'further' must be used instead of 'farther'.

Key Concept

Distinguishing between 'further' (additional degree or extent) and 'farther' (physical distance) as modifiers.
Question 704Question →

Complete the reported speech transformation below by filling in the missing grammatical forms in the blanks.

Fill in the blanks below

Direct Speech: The lead archaeologist stated, "We discovered these ancient artifacts near the riverbank yesterday."

Reported Speech: The lead archaeologist stated that they those ancient artifacts near the riverbank .
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Answer

The reported speech sentence is completed with 'had discovered' in the first blank and 'the previous day' (or 'the day before') in the second blank.
When converting from direct speech to reported speech with a past reporting verb ('stated'), the simple past tense ('discovered') backshifts to past perfect ('had discovered'), and the time expression 'yesterday' changes to 'the previous day' or 'the day before'.

Step-by-Step Solution

1
Determine the correct tense backshift for the past simple verb in direct speech.
The simple past verb 'discovered' shifts to the past perfect form 'had discovered'.
When a reporting verb in past tense ('stated') introduces direct speech in simple past tense, the verb must backshift to past perfect in reported speech.
2
Determine the appropriate transformation for the temporal adverbial.
The adverb of time 'yesterday' changes to 'the previous day' or 'the day before'.
Time words shift in indirect speech to align with the altered time of reporting.

Key Concept

Tense Backshift and Temporal Adverbial Conversion in Reported Speech
Question 705Question →

Complete the sentence below by supplying the correct possessive pronoun that maintains proper grammatical agreement in standard formal English.

Fill in the blanks below

Neither the lead architect nor the site engineers could locate detailed blueprints when the municipal inspectors arrived.
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Answer

The correct pronoun to complete the sentence is 'their'.
In standard English grammar, when subjects are joined by correlative conjunctions such as 'neither... nor...' or 'either... or...', the possessive pronoun must agree in number with the nearer antecedent. In this sentence, the noun phrase nearest to the blank is the plural noun 'site engineers', which requires the plural possessive pronoun 'their'.

Step-by-Step Solution

1
Identify the compound antecedent and the connecting correlative conjunction.
The subject contains two elements: 'the lead architect' (singular) and 'the site engineers' (plural), joined by 'neither... nor...'.
When compound antecedents are joined by correlative conjunctions like 'neither... nor...', pronoun agreement is governed by the rule of proximity.
2
Determine the antecedent closest to the pronoun blank.
The closer antecedent is 'the site engineers', which is plural.
The pronoun must agree in number with the nearer noun phrase in the sentence structure.
3
Select the appropriate possessive pronoun.
The plural possessive pronoun 'their' correctly matches the plural antecedent 'site engineers'.
Using 'their' completes the sentence in alignment with standard grammatical rules of proximity.

Key Concept

Pronoun-Antecedent Agreement with Correlative Conjunctions (Rule of Proximity)
Estimated Time:1m 0s
Question 706Question →

Which option contains the correct pair of verb forms to complete the sentence below?

"The chief medical officer, together with several senior pathologists who _____ recently appointed to the emergency task force, _____ that the containment strategy is effective."

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Answer: were / believes

Answer

The pair of verb forms that correctly completes the sentence is 'were / believes'.
The relative pronoun 'who' modifies the plural antecedent 'senior pathologists', requiring the plural past-tense verb 'were'. Meanwhile, the main clause subject is 'The chief medical officer', which is singular. Expressions introduced by 'together with' are quasi-adjuncts and do not form a compound subject, so the main verb must remain singular ('believes').

Step-by-Step Solution

1
Analyze the subject-verb relationship in the embedded relative clause.
The relative pronoun 'who' refers to the plural antecedent 'senior pathologists'.
A relative pronoun takes a verb that agrees in number with its antecedent, so the plural verb 'were' is required for the first blank.
2
Identify the primary grammatical subject of the main clause.
The head noun of the main clause is 'The chief medical officer', which is singular.
Parenthetical or quasi-coordinating prepositional phrases introduced by 'together with', 'along with', or 'as well as' do not make the subject plural.
3
Select the main clause verb that agrees with the singular head subject.
The singular verb form 'believes' must be used in the second blank.
The verb must agree strictly with 'The chief medical officer' regardless of intervening plural nouns.

Key Concept

Concord with Parenthetical Phrases and Relative Clause Antecedents
Question 707Question →

Complete the sentence below by supplying the grammatically correct form of the verb 'clear' in the blank to complete the sentence with the appropriate tense and aspect.

Fill in the blanks below

By the time the lead archaeologist arrived at the excavation site, the junior researchers the ancient artifacts from the main chamber.
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Answer

had cleared
The past perfect form 'had cleared' is required because the sentence describes an action completed prior to another past point in time ('arrived'). The prepositional time phrase 'by the time' paired with a simple past tense verb in the time clause necessitates the past perfect aspect in the main clause.

Step-by-Step Solution

1
Identify the past time reference in the dependent clause.
The clause 'By the time the lead archaeologist arrived' establishes a past reference point using the simple past verb 'arrived'.
Identifying the temporal anchor is necessary to establish correct sequence of tenses.
2
Determine the relationship between the two past actions.
The action in the main clause (moving the artifacts) was completed before the arrival of the archaeologist.
An action that occurred and finished prior to another past event requires the past perfect aspect.
3
Conjugate the verb 'clear' into the past perfect tense.
'had cleared'
Combining the past auxiliary 'had' with the past participle 'cleared' forms the past perfect structure.

Key Concept

Past Perfect Aspect in Time Clauses
Question 708Question →

Which of the following conjunctions correctly completes the sentence below to form a grammatically valid clause of reason?

"The executive council approved the capital grant, _______ the project proposal demonstrated exceptional feasibility and strategic alignment with state objectives."

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Answer: inasmuch as

Answer

The conjunction 'inasmuch as' correctly introduces the subordinate adverbial clause of cause/reason.
The compound subordinating conjunction 'inasmuch as' (written as one word 'inasmuch' followed by 'as') is used in formal English to introduce an adverbial clause of cause or extent, meaning 'since', 'because', or 'in view of the fact that'. It properly links the main clause to its underlying justification.

Step-by-Step Solution

1
Analyze the main clause and subordinate clause relationship.
The main clause expresses an action taken by the council ('approved the capital grant'), while the subordinate clause provides the justifying reason or cause ('the project proposal demonstrated exceptional feasibility').
Identifying the clause relationship determines which type of subordinating conjunction is required.
2
Evaluate the functional meaning and correct orthography of formal subordinating conjunctions of reason.
'Inasmuch as' is a formal compound subordinating conjunction written as a single word 'inasmuch' followed by 'as'. It functions synonymously with 'since', 'because', or 'seeing that'.
Formal English requires exact conjunction spelling and prepositions.
3
Test the options against formal grammatical standards.
'Inasmuch as' is the only option that is both orthographically correct and syntactically standard.
Forms with missing particles or segmented words break standard English clause structure rules.

Key Concept

Subordinating Conjunctions of Reason and Extent (inasmuch as)
Question 709Question →

Which of the following sentences is grammatically correct and demonstrates proper modifier usage?

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Answer: Having thoroughly reviewed the forensic evidence, the investigator presented a comprehensive report to the commission.

Answer

Having thoroughly reviewed the forensic evidence, the investigator presented a comprehensive report to the commission.
The sentence reading 'Having thoroughly reviewed the forensic evidence, the investigator presented a comprehensive report to the commission' is grammatically correct because the introductory participial modifier logically modifies 'the investigator'. Furthermore, the adverb 'thoroughly' and adjective 'comprehensive' are used accurately in formal context.

Step-by-Step Solution

1
Analyze the intro participial phrase
The phrase 'Having thoroughly reviewed the forensic evidence' functions as an adjectival modifier.
Participial modifiers must logically attach to the noun immediately following the comma.
2
Check subject attachment in each option
In the correct sentence, 'the investigator' immediately follows the introductory modifier because the investigator performed the action of reviewing.
Placing 'a comprehensive report' after the comma creates a dangling modifier, as a report cannot review evidence.
3
Evaluate adjective and adverb choices
'Thoroughly' correctly modifies the verb 'reviewed', and 'comprehensive' accurately describes the report without lexical confusion or unnatural collocation.
Modifiers must be chosen for precise contextual meaning and natural academic register.

Key Concept

Participial Modifier Placement and Diction Precision
Estimated Time:1m 0s
Question 710Question →

In the sentence below, a pronoun is needed to fill the blank in accordance with standard formal English rules:

"Everybody who registered for the weekend leadership seminar must present ______ digital entry pass at the security desk."

Which of the following pronouns correctly completes the sentence to maintain proper pronoun-antecedent agreement?

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Answer: his or her

Answer

The correct phrase is 'his or her' because the antecedent 'Everybody' is a singular indefinite pronoun referring to people in formal English.
The antecedent 'Everybody' is a singular indefinite pronoun. In formal standard English assessed by JAMB UTME, singular indefinite pronouns require singular possessive pronouns ('his or her') to ensure exact grammatical concord.

Step-by-Step Solution

1
Identify the antecedent to which the missing pronoun refers.
The antecedent is the indefinite pronoun 'Everybody'.
Indefinite pronouns ending in '-body' or '-one' are grammatically singular in standard English syntax.
2
Determine the appropriate possessive form that agrees in number and gender.
'His or her' correctly provides singular possessive agreement for human antecedents of unspecified gender.
Plural possessive forms like 'their' break strict singular agreement rules required in formal assessments.

Key Concept

Pronoun-Antecedent Agreement with Singular Indefinite Pronouns
Estimated Time:1m 0s
Question 711Question →

Consider the direct speech statement: The lead researcher remarked to the delegates, "We have completed the first phase of the clinical trial today."

Which of the following options correctly renders the statement above in reported speech?

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Answer: The lead researcher remarked to the delegates that they had completed the first phase of the clinical trial that day.

Answer

The lead researcher remarked to the delegates that they had completed the first phase of the clinical trial that day.
The correct option properly changes the pronoun 'we' to 'they', backshifts the present perfect verb form 'have completed' to the past perfect 'had completed', and converts the time expression 'today' to 'that day'.

Step-by-Step Solution

1
Identify the reporting verb and its tense
The reporting verb 'remarked' is in the past tense, requiring backshift of tenses and changes to pronouns and time words.
When the reporting verb is in the past tense, verbs and temporal markers in reported speech must be shifted back into the past.
2
Change pronouns and backshift verb tenses
'We' becomes 'they', and 'have completed' (present perfect) shifts to 'had completed' (past perfect).
Reported speech shifts perspective to third-person and moves the time frame back one step in the past.
3
Convert time adverbials
'Today' changes to 'that day'.
Adverbs of time must shift relative to the point of reporting when governed by a past-tense reporting verb.

Key Concept

Backshifting tenses, pronoun adjustment, and temporal adverb changes in reported speech
Question 712Question →

Complete the sentence below by supplying the appropriate connective word that correctly completes the correlative clause structure.

Fill in the blanks below

Scarcely had the lead researcher presented the preliminary findings the review panel called for an immediate audit of the data.
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Answer

The correct connective to complete the sentence is 'when' (or 'before').
The temporal subordinator 'when' (or 'before') correctly completes the correlative structure introduced by 'scarcely', creating a grammatically sound adverbial clause of time.

Step-by-Step Solution

1
Analyze the introductory structure of the sentence.
The sentence begins with the restrictive adverbial 'Scarcely had...', requiring negative inversion in the main clause.
When a sentence starts with restrictive adverbs such as 'scarcely' or 'hardly', inverted auxiliary-subject word order is required.
2
Identify the mandatory correlative subordinator for 'scarcely'.
The standard correlative pairing for 'scarcely' when expressing immediately sequential past events is 'scarcely... when' (or 'scarcely... before').
Using alternative conjunctions like 'than' or 'that' breaks the standard correlative rule for time-clause inversion.

Key Concept

Correlative Conjunctions and Clause Structure
Question 713Question →

Complete the sentence below by supplying the correct present-tense verb form for each blank to satisfy the rules of subject-verb concord.

Fill in the blanks below

Each of the structural engineers who deployed to inspect the dam site expected to submit a comprehensive safety report.
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Answer

Blank 1 requires the plural verb 'are' to agree with the plural antecedent 'engineers', while Blank 2 requires the singular verb 'is' to agree with the singular indefinite pronoun subject 'Each'.
For Blank 1, the relative pronoun 'who' refers to the plural noun antecedent 'engineers', making the plural verb 'are' grammatically mandatory within the relative clause. For Blank 2, the syntactic head of the main subject phrase is the distributive indefinite pronoun 'Each', which takes a singular verb, requiring 'is'.

Step-by-Step Solution

1
Analyze the subject-verb relation for Blank 1
The relative pronoun 'who' introduces a relative clause modifying the plural antecedent 'structural engineers'.
When a relative pronoun (who/which/that) acts as the subject of a dependent clause, its verb must agree in number with its antecedent. Since 'engineers' is plural, Blank 1 requires the plural verb 'are'.
2
Analyze the main clause subject and verb for Blank 2
The main clause subject is the indefinite pronoun 'Each'.
Indefinite pronouns such as 'each', 'everyone', and 'either' are grammatically singular when preceding a prepositional phrase (e.g., 'of the structural engineers'). Therefore, the main verb in Blank 2 must be singular ('is').

Key Concept

Subject-Verb Agreement with Relative Pronoun Antecedents and Indefinite Pronouns
Question 714Question →

The principal research officer expressed deep regret during the project debriefing, wishing the field team _______ the demographic sample more thoroughly prior to publishing the survey. Which verb form correctly completes the sentence?

Show answer & explanation

Answer: had verified

Answer

The correct option is 'had verified'.
The correct option is 'had verified'. In English grammar, when the verb 'wish' is used to express regret about an action that did not happen in the past, the verb in the dependent clause must be in the past perfect tense ('had' + past participle). Since the research officer is expressing regret after the survey was published, 'had verified' properly denotes the unfulfilled past action.

Step-by-Step Solution

1
Analyze the context and time frame of the sentence stem.
The main clause ('expressed deep regret') is in the past, indicating that the action referred to in the subordinate clause occurred prior to this past reference point.
The sentence involves expressing an unfulfilled wish or regret about a past action.
2
Apply the rule governing unreal past expressions following the verb 'wish'.
An unfulfilled wish about the past requires the past perfect aspect (had + past participle).
This subjunctive construction backshifts the past event into the past perfect to signal its counterfactual nature.
3
Select the option that matches 'had' + past participle.
'had verified' is the only option with the correct past perfect form.
It fulfills both grammatical concord and aspectual requirements.

Key Concept

Unreal Past and Subjunctive Aspect with 'Wish'
Question 715Question →

Complete the reported speech transformation below by filling in the blanks with the correct grammatical forms.

Fill in the blanks below

Direct Speech: The environmental scientist informed the panel, "The coastal mangrove restoration project has achieved its primary target this month."

Reported Speech: The environmental scientist informed the panel that the coastal mangrove restoration project its primary target .
Show answer & explanation

Answer

The correct words to fill the blanks are 'had achieved' for the first blank and 'that month' for the second blank.
When converting direct speech into indirect speech following a past-tense reporting verb ('informed'), the present perfect verb phrase ('has achieved') must backshift to the past perfect tense ('had achieved'). Additionally, time markers indicating present proximity ('this month') must shift to remote past markers ('that month').

Step-by-Step Solution

1
Analyze the tense of the main verb in direct speech and the reporting verb.
The reporting verb 'informed' is in the simple past tense, and the direct statement uses the present perfect verb 'has achieved'.
A past-tense reporting verb mandates a tense backshift in the reported clause.
2
Backshift the present perfect verb tense to past perfect.
'has achieved' becomes 'had achieved'.
In reported speech, present perfect forms shift back to past perfect when referring to completed prior actions.
3
Adjust temporal and demonstrative expressions.
'this month' shifts to 'that month'.
Demonstratives showing time proximity shift to remote forms when reported from a past point of reference.

Key Concept

Direct and Indirect (Reported) Speech Tense Backshift and Adverbial Modification
Question 716Question →

Complete the sentence below by supplying the most grammatically appropriate adverb in the blank space.

Fill in the blanks below

Despite working into the night to finalize the regional environmental report, the research team could barely cover all the affected zones.
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Answer

late
The adverb 'late' correctly functions to show that the action of working continued far into the night. Unlike many adverbs, 'late' retains its adverbial form without adding '-ly' when denoting time past the customary hour.

Step-by-Step Solution

1
Analyze the context to determine the required function of the modifier in the phrase 'working ... into the night'.
The word must serve as an adverb of time modifying 'working' and indicating a duration extending far into the evening.
The modifier describes how far into the night the action continued.
2
Evaluate the morphological distinction between 'late' and 'lately'.
'Late' functions as both an adjective and an adverb meaning near the end of a period of time, whereas 'lately' means 'recently'.
Using 'lately' in this sentence would erroneously mean 'working recently into the night', which is semantically incorrect. The correct flat adverb form is 'late'.

Key Concept

Distinguishing between flat adverbs ('late') and '-ly' adverbs with distinct meanings ('lately').
Estimated Time:1m 0s
Question 717Question →

Complete the sentence below by filling in the blank with the appropriate preposition.

Fill in the blanks below

Despite the overwhelming evidence presented by the prosecution, the tribunal found the accused officer innocent and subsequently acquitted him all charges of corruption.
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Answer

The correct preposition to fill the blank is 'of'.
The verb 'acquit' collocates specifically with the preposition 'of' when denoting the offense or accusation from which a person is declared not guilty (e.g., 'to acquit someone of charges'). Therefore, 'of' is the only grammatically accepted preposition in this sentence.

Step-by-Step Solution

1
Identify the principal verb and its required dependent preposition in the context of legal charges.
The verb 'acquit' governs the fixed preposition 'of' when stating the crime or offense.
In standard English grammar, 'acquit' forms a fixed collocation: to acquit someone of a charge or crime.

Key Concept

Dependent Prepositions (acquit of)
Estimated Time:45s
Question 718Question →

Which option correctly completes the sentence below?

"Professor Danjuma is the only one of the committee members who _____ consistently opposed the proposed administrative restructuring."

Show answer & explanation

Answer: has

Answer

The correct option is 'has'.
In standard English concord, when a relative clause follows 'the only one of + plural noun', the relative pronoun 'who' takes a singular verb because 'the only one' singles out one individual as the sole subject performing the action. Therefore, the singular present perfect auxiliary 'has' is required.

Step-by-Step Solution

1
Identify the subject-noun phrase and the structure governing the relative clause.
The sentence uses the specific grammatical structure 'the only one of + plural noun + relative pronoun (who)'.
Determining whether the relative pronoun refers to 'one' or the plural noun 'committee members' dictates whether a singular or plural verb is needed.
2
Apply the rule of concord for 'the only one of...'.
Unlike 'one of the [plural noun] who [plural verb]', adding 'the only' restricts the focus exclusively to the singular antecedent 'one'.
Because 'one' is the true antecedent of 'who', the verb following 'who' must be singular.
3
Select the correct singular verb form that fits the aspect of the sentence.
'has' is singular present perfect, correctly completing 'has consistently opposed'.
The singular verb 'has' satisfies both grammatical agreement with 'one' and perfect aspect with the past participle 'opposed'.

Key Concept

Subject-Verb Agreement with 'The Only One Of' Relative Clauses
Estimated Time:1m 15s
Question 719Question →

The academic dean emphasized during the board meeting that it was high time the committee _______ the updated accreditation guidelines. Which verb form correctly completes the sentence?

Show answer & explanation

Answer: submitted

Answer

The past simple form 'submitted' correctly completes the sentence.
The fixed idiomatic structure 'it is high time' (or 'it was high time') followed by a subject noun phrase requires the verb to be in the simple past tense ('submitted'). This usage represents an unreal past construction denoting that an action is urgently overdue.

Step-by-Step Solution

1
Identify the syntactic trigger in the clause.
The main clause introduces the fixed subjunctive expression 'it was high time' (or 'it is high time').
The expression 'it is / was high time' introduces a situation where an action is overdue.
2
Apply the tense rule governing 'it is high time + subject'.
The finite verb in the subordinate clause must take the simple past tense (unreal past).
English grammar requires an unreal past verb form to express present or immediate necessity after this expression.
3
Evaluate the choices to find the simple past form.
The option containing 'submitted' provides the required simple past tense.
Present forms, present perfect forms, and modal insertions violate the unreal past constraint.

Key Concept

Unreal Past Tense after 'It is high time'
Question 720Question →

Complete the sentence below by supplying the correct auxiliary verb form that satisfies the rules of grammatical concord.

Fill in the blanks below

Dr. Adeleke is the only one of the senior researchers who received the prestigious international fellowship this year.
Show answer & explanation

Answer

The correct verb form to complete the blank is 'has'.
The singular verb 'has' is required because the phrase 'the only one of' specifies a single individual as the antecedent of the relative pronoun 'who'. Consequently, the verb following 'who' must agree with the singular noun 'one'.

Step-by-Step Solution

1
Analyze the subject structure and the effect of the phrase 'the only one of' on the relative clause.
The phrase 'the only one of' restricts the antecedent of the relative pronoun 'who' to the singular concept 'one', rather than the plural noun 'researchers'.
In standard English concord, while 'one of those who' takes a plural verb, adding 'the only' shifts the focus to the single individual, requiring a singular verb in the relative clause.
2
Select the appropriate third-person singular present perfect auxiliary verb.
The correct singular auxiliary verb is 'has'.
'has' agrees in number with the singular antecedent 'the only one'.

Key Concept

Subject-Verb Agreement with Relative Clauses and Restrictive Phrases ('The Only One Of')
Estimated Time:1m 0s
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