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          At the beginning of class, the noise of desks _____ could be heard outside the classroom. 

          A. opened and closed
          B. to be opened and closed
          C. being opened and closed 
          D. to open and close 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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