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				 The noise of the desks       could be heard in the next classroom.    A. being opened and closed      B. opened and closed    C. having been opened and closed    D. to be opened and closed			【查看更多】
			


		
           
          


		
          
		
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            The noise of the desks _____ could be heard in the next classroom.
            
                A. being opened and closed                   B. opened and closed
            
                C. having been opened and closed           D. to be opened and closed
          

			
          
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