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— Has Sam finished his homework today? ...

 — Has Sam finished his homework today?

—I have no idea. He ______  it this morning.

A. did                        B. has done              C. was doing             D. had done

 

 C 根据题干,语境应为“我不知道,今天早晨他还在做”,A为一般过去时,强调在过去 某一时间做某事,不强调结果;B为现在完成时,在过去发生,强调对现在的影响;C为过 去进行时,指在过去某一时间正在做某事;D为过去完成时,表达过去的过去。所以C为正确答案。
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