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Difficulty: MediumShifts in Construction

Although electric eels are famous for their ability to generate strong electrical discharges, they use these pulses primarily for navigation. In the murky waters of the Amazon Basin, an eel emits weak electrical signals to scan its surroundings. After these signals bounced off nearby objects, the eel's specialized receptors detect the returning current to map the environment.

Which choice most effectively maintains a consistent grammatical construction and tense throughout the sentence?

  1. A
    NO CHANGE
  2. After these signals bounce off nearby objects, the eel's specialized receptors detectAnswer
  3. C
    After these signals had bounced off nearby objects, the eel's specialized receptors will detect
  4. D
    Bouncing off nearby objects, the eel's specialized receptors detect

Answer

The correct option is the one that uses the present tense verb 'bounce' ('After these signals bounce off nearby objects, the eel's specialized receptors detect'), maintaining consistency with the present tense of the rest of the passage.
The correct option maintains a consistent present tense throughout the paragraph. Because the passage describes standard scientific facts about the electric eel using present tense verbs ('are,' 'use,' and 'emits'), the subordinate clause in the final sentence must also use the present tense verb 'bounce' to match the main verb 'detect.'

Step-by-Step Solution

1
Analyze the verb tenses in the surrounding sentences to establish the narrative timeline.
The verbs 'are' (present), 'use' (present), and 'emits' (present) establish that the passage is written in the present tense to describe scientific facts.
Verb tenses must remain consistent throughout a passage unless there is a logical reason to shift timeframes.
2
Evaluate the underlined verb tense relative to the main verb of the sentence.
The underlined subordinate clause uses 'bounced' (past tense), while the main verb is 'detect' (present tense). This is an inconsistent shift.
Both verbs describe a simultaneous, recurring process and should share the same present tense.
3
Identify the option that corrects this tense shift without introducing new grammatical errors.
The choice using 'bounce' provides the correct present tense. The option starting with 'Bouncing' introduces a dangling modifier, and the option with 'had bounced' and 'will detect' introduces confusing tense changes.
Only the correct option maintains both verb tense consistency and logical modifier placement.

Key Concept

Shifts in Construction (Verb Tense Consistency)
Estimated Time:1m 0s
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Topics

Shifts in Construction

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