Choose the correct form: The quality of these instruments ____ excellent.
Correct answer: B. is
- A. are
- B. is
- C. were
- D. have been
Explanation
The subject is quality, which is singular, so the verb must be is. The plural noun instruments sits inside a prepositional phrase and can never be the subject of the sentence. Intervening phrases like this are the standard trap in subject-verb agreement items.
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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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