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    12． --What it be? --It can't be a mail box, for it's moving. It be a car. A. must; must B. can; can C. can; must D. must; can 【查看更多】

     

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    — What ________ it be?     
    — It can't be a mail box, for it's moving. It ________ be a car.    
    [      ]
    A. must; must    
    B. can; can      
    C. can; must    
    D. must; can

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