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    The Smiths their bags with their clothes in the sitting room. a. are busy filling b. is busy filling c. are busy to fill d. is busy to fill 【查看更多】

     

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    The Smiths _____ their bags with their clothes in the sitting room.      
    [     ]
    A. are busy filling  
    B. is busy filling      
    C. are busy to fill    
    D. is busy to fill

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