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Question

Difficulty: HardModal Auxiliaries and Expressing Modality

Select the option that best completes the sentence below:

'Having observed that the official security seal remained completely unbroken prior to the inspection, the lead auditor concluded that the consignment __________ tampered with during transit.'

  1. could not have beenAnswer
  2. B
    might not could have been
  3. C
    must not to have been
  4. D
    should not have being

Answer

The correct option is 'could not have been', which properly expresses a logical deduction of impossibility in the past based on available evidence.
The phrase 'could not have been' accurately expresses logical past impossibility. The contextual fact that the security seal was completely unbroken provides factual ground to logically deduce that tampering was impossible during transit.

Step-by-Step Solution

1
Analyze the contextual clue provided in the sentence.
The clause 'the official security seal remained completely unbroken' provides definitive evidence regarding the state of the consignment.
Modal selection depends on the speaker's degree of certainty or logical deduction derived from surrounding context.
2
Determine the appropriate modal meaning and tense required.
The sentence requires a modal auxiliary structure that expresses logical deduction of impossibility in the past.
The event (transit) occurred in the past, and the unbroken seal logically rules out the possibility of tampering.
3
Evaluate grammatical compliance of modal auxiliary structures.
'Could not have been' correctly pairs the modal 'could' with the negative particle 'not' and the perfect passive auxiliary 'have been' followed by the past participle 'tampered'.
Modal verbs must be followed by a bare infinitive ('have'), and perfect passive constructions require 'been + past participle'.

Key Concept

Logical deduction of past impossibility using modal perfect passive structures ('could not have been + past participle').
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Topics

Modal Auxiliaries and Expressing Modality

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