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    I haven't heard from Bill he left here. A. when B. before C. since D. after 【查看更多】

     

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     I haven’t heard from Bill ________ he left here.

    A. when       B. before            C. since              D. while

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    I haven’t heard from Bill ________ he left here.

    A．when                                B．before

    C．since                                 D．while

     

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    I haven't heard from Bill ________ he left here．

    [　　]

    A．when

    B．before

    C．since

    D．while

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