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    精英家教网 > 高中英语 > 题目详情

    ______ over and over again, but he still couldn’t understand.
    A．Having explainedB．Having been explained
    C．ExplainingD．It had been explained
    D
    本题考查时态。本题根据but he still couldn’t understand为过去时，故从句用过去完成时。句意：它解释了一遍又一遍，但他仍无法理解。
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