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— 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


解析:

根据后面时间状语this morning可判断为过去时,排除B;进行体表示“示完成性,暂时性,感情色彩”。结合上句,不知道Sam是否做完,所以C 项是最佳答案。

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