Complete the sentence: The police _ out crimes for years.
Correct answer: B. have been wiping
- A. has been wiping
- B. have been wiping
- C. wipes
- D. wiped
Explanation
The sentence is in the present continuous tense. 'Has been' is used for singular subjects (incorrect in this case.) 'Have' is used for plural subjects. 'Wiped' is in past tense and 'wipes' is in present tense. Hence 'have been wiping' is most suitable as it is a continuous present tense.
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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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