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    They worked long hours for several weeks everything returned to normal. A. before B. when C. since D. unless 【查看更多】

     

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    They worked long hours for several weeks ________ everything returned to normal．

    [　　]
    A．

    before

    B．

    when

    C．

    since

    D．

    unless

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    They had worked long hours for several weeks ________ everything returned to normal．

    [　　]

    A．until

    B．since

    C．before

    D．when

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