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    Cars and buses stop when the traffic lights turn red. A. can B. need C. may D. must 【查看更多】

     

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    Cars and buses________ stop when the traffic lights turn red.
    [     ]
    A. can      
    B. need      
    C. may     
    D. must

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    Cars and buses ________ stop when the traffic lights turn red.

    [　　]

    A．can
    B．need
    C．may
    D．must

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