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    Drivers are warned when they are tired. A. to drive B. not drive C. not to drive D. not driving 【查看更多】

     

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    Drivers are warned___________when they are tired.

    A．to drive

    B．not drive

    C．not to drive

    D．not driving

     

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    Drivers are warned ________ when they are tired．

    [　　]

    A．to drive

    B．not drive

    C．not to drive

    D．not driving

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