The experiment ______ by the time the funding ran out.

Answer and explanation

Correct answer: D. had been completed

  1. Step 1: The funding ran out in the past, so the earlier action uses the past perfect. Step 2. The experiment is the receiver of the action, so the passive is needed. Answer: had been completed. Why not the others: these forms do not match the time relationship.

Practise more Grammar in Context (Set 2).

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