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    ( ) we were walking along the river, we heard a cry for help. A.While B.Until C.After D.Before 【查看更多】

     

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        _     we were walking along the river, we heard a cry for help.

    A. While                 B. Until            C. After           D. Before

     

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    _______  we were walking along the river, we heard a cry for help.
    [     ]
    A. While
    B. Until
    C. After
    D. Before

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    ________ we were walking along the river, we heard a cry for help．

    [　　]

    A．While

    B．Until

    C．After

    D．Before

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