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          While I _______ TV in the sitting room, the bell _______.
          A．watches, ringsB．watched, rang
          C．was watching, rangD．watched, was ringing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          while引導(dǎo)的時(shí)間狀語從句，一般情況要用進(jìn)行時(shí)態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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