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    23．A．while B．until C．before D．after 【查看更多】

     

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    The thief stole my wallet ________ I knew it.

    [　　]

    A．before
    B．after
    C．until
    D．while

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    I had not been waiting very long _____ he returned from the conference in the town.

    A．until     B．after            C．while          D．before

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    Let me say sorry to her? No way!1 would die      I apologize to her!

    A．after             B．before                  C．until     D． while

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    Someone called me at midnight, but he hung up ________ I could answer it.

    [　　]

    A．after
    B．before
    C．until
    D．while

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    Children should be warned that it’s dangerous to open the microwave oven ________ it is still working．

    [　　]

    A．until

    B．after

    C．before

    D．while

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