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    They kept digging they must have known there was no hope. A. as B. while C. when D. unless 【查看更多】

     

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    They kept digging ________they must have known there was no hope.

    A. as                            B. while                 C. when                              D. unless

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    They kept digging ________ they must have known there was no hope．

    [　　]

    A．as

    B．while

    C．when

    D．unless

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