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    By the time I back they up ten metres. A. came-have climbed B. came-had climbed C. come-have climbed D. had come-climbed 【查看更多】

     

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    By the time I ________ back they ________ up ten metres.

    [　　]

    A．came, have climbed

    B．came, had climbed

    C．come, have climbed

    D．had come, climbed

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