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    精英家教网 > 高中英语 > 题目详情
    This problem is said _______ three times, but he still can’t understand it.
    A．to have been explainingB．to have explained
    C．having been explainedD．to have been explained
    D

    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。
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