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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
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科目：初中英語 來源：期中題 題型：單選題

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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