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    【题目】I don’t know what he _______when Mr.Wu came in .

    A. was doing B. has done C. is doing D. would do

    【答案】A

    【解析】

    句意：我不知道当吴老师进来的时候他正在做什么。was doing正在做，过去进行时；has done已经做了，现在完成时；is doing现在进行时；would do过去将来时。根据句意when Mr. Wu came in可知，这里表示过去正在发生的动作，应用过去进行时态，故选A。

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