She _ the floor when her cousin came in. She scolded him angrily because he made the floor dirty with his muddy shoes.
Correct answer: B. Was mopping
- A. Mopped
- B. Was mopping
- C. Mops
- D. Is mopping
Explanation
The sentence indicates an action that happened in the past, so the helping verb used should also be in past, hence option B was moping is the most appropriate one.
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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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