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    ( ) is really hard them to climb up the mountain at night. A. This, to B. It, for C. This, for D. It, to 【查看更多】

     

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    ________ is really hard ________ them to climb up the mountain at night．

    [　　]

    A．This, to

    B．It, for

    C．This, for

    D．It, to

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