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           We ___________ when the teacher came in.
          A．were talkingB．talked
          C．talkD．a(chǎn)re talking
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A 
          A “正在做某事時，某事突然發(fā)生”常用when，即be doing sth. When sth. else did（用動詞的過去式）�！拔覀冋谡勗挄r，老師進(jìn)來了。”故用過去進(jìn)行時。故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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