Harry was the only one of the Earthmen who _ trying to build a rocket.
Correct answer: A. Was
- A. Was
- B. Were
- C. Is
- D. Has
Explanation
The verb 'was' appropriately matches the singular subject 'Harry', indicating that he alone was engaged in the action of trying to build a rocket.
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About Subject-Verb Agreement
Subject-verb agreement requires the verb to match the true subject in number and person, even when other words intervene. Questions cover collective nouns, compound subjects, indefinite pronouns, either and neither, relative clauses, quantities and inverted sentences, where proximity can falsely suggest the wrong verb.
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