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    over and over again, but he still couldn't understand. A.Having explained B.Having been explained C.Explaining D.It had been explained 【查看更多】

     

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    ______ over and over again, but he still couldn't understand.

           A.Having explained              B.Having been explained      

           C.Explaining                 D.It had been explained

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    ______ over and over again, but he still couldn't understand.

    A．Having explained

    B．Having been explained

    C．Explaining

    D．It had been explained

     

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