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          What was he doing ______ his father _______ back?
          A. while; came          B. when; came              C. when; was coming
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意:當(dāng)他的父親回來的時候，他正在做什么？while當(dāng)……時候，后跟的動詞通常是持續(xù)性動詞；when當(dāng)……時候，后跟的動詞通常是持續(xù)性動詞或非持續(xù)性動詞；因為在主句里的動作發(fā)生在過去，所以從句的動作也是發(fā)生在過去。根據(jù)句意故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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