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          While Jim ______the floor, someone ______at the door.
          A．was sweeping, was knockingB．was sweeping, knocked 
          C．swept ,was knockingD．swept, knocked
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          while引導(dǎo)的從句一般用進(jìn)行時態(tài)，而主句為一般時態(tài)，故選答案為B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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