题目内容

---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A．didB．has doneC．was doingD．had done
C
考查时态。句意：今天Sam完成作业了吗？我不知道，他今天上午在做。表示过去某一时刻进行的动作用过去进行时态。根据题意上午那个时刻他在做作业，故选C。
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