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    This problem is said _______ three times, but he still can’t understand it.

    A. to have been explaining               B. to have explained

    C. having been explained                 D. to have been explained

     

    【答案】

    D

    【解析】

    试题分析：句意：这个问题被解释了三次了，但是他还是不明白。这里是sth be said to do，故排除C；这里This problem与explain之间是被动关系，故排除AB；根据句意故选D。

    考点：考查非谓语动词的用法。

     

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