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          ---Why is the classroom so dirty? 
          --- Sorry, sir. It ______ yesterday. We forgot to do it. 
          A．doesn’t cleanB．didn’t cleanC．isn’t cleanedD．wasn’t cleaned
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          根據(jù)yesterday，可知本題考查的是一般過去時的被動語態(tài)，故選D
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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