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    精英家教网 > 高中英语 > 题目详情
    —Has Sam finished his homework today?
    —I have no idea. He ________ it this morning.
    A．didB．has doneC．was doingD．had done
    C
     根据句意“我不知道Sam现在是否已经做完了作业，(但是我知道)他今天早上一直在做作业”，可知要用过去进行时。
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