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          用 when或 while填空。
          1. I was looking out of the window _________ the teacher asked me.
          2. What is he doing _________ his parents came back？
          3. Mike was playing games _________ Jack was studying.
          4. I was about to fall asleep _________ the baby began to cry.
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          1. when    2. when    3. while   4. when
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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