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    You should understand the traffic rule by now. You've had it often enough. A. explaining B. to explain C. explain D. explained 【查看更多】

     

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    (2005·天津)

    You should understand the traffic rule by now. You've had it ________ often enough.

    [　　]

    A．explaining
    B．to explain
    C．explain
    D．explained

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