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    9．( )When the traffic lights are red, we stop and wait. A．may B．must C．might D．could 【查看更多】

     

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    When the traffic lights are red, we          stop and wait.

    A．may  B．must  C．might       D．could

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    When the traffic lights are red, we _________ stop and wait．

    [　　]

    A．may

    B．can

    C．might

    D．must

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