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Question

Difficulty: EasyVerb Tense, Aspect, and Mood

In 1977, marine scientists discovered hydrothermal vents on the ocean floor, revealing complex ecosystems that thrive in complete darkness. This pioneering exploration permanently ________ our understanding of biology and prompted researchers to rethink the conditions under which life could survive in the universe.

Which choice completes the passage so that it conforms to the conventions of Standard English?

  1. A
    transforms
  2. transformedAnswer
  3. C
    will transform
  4. D
    is transforming

Answer

transformed
The correct answer is the past-tense verb 'transformed'. The passage describes a past scientific event ('In 1977... discovered') and uses the past-tense verb 'prompted' to describe a concurrent effect. The verb completing the blank must also be in the simple past tense to maintain parallel structure and temporal consistency.

Step-by-Step Solution

1
Identify the timeline and verbs in the context.
The passage describes a historical event in 1977 using past tense verbs ('discovered', 'prompted').
This establishes the temporal framework of the sentence.
2
Select the verb form that maintains consistency with this past-tense framework.
The simple past tense 'transformed' fits parallelly with 'prompted' in the compound predicate.
Maintaining consistent verb tense prevents confusing shifts in time.

Key Concept

Verb Tense Consistency
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Topics

Verb Tense, Aspect, and Mood

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