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    Although our environment is much better than before, a lot of work must _____    

    A. to do        
    B. be done      
    C. to be done    
    D. be doing
    B
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    科目：初中英语 来源：期中题 题型：单选题

    Although our environment is much better than before,a lot of work must _____    
    [     ]
    A. to do        
    B. be done      
    C. to be done    
    D. be doing

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