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          — You look scared. What happened?
          — Well , I _______ along the street ________ the UFO landed.
          A．was walking ; whileB．is walking ; when
          C．was walking ; whenD．is walking ; while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          此題重點考查when和while引導的時間狀語從句的基本區(qū)別。When引導的時間狀語從句常用一般時態(tài)，有時也用進行時態(tài)；while引導的時間狀語從句常用進行時態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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