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          Mr Green was watching TV ______ someone knocked at the door. 

          A. while 
          B. when 
          C. since 
          D. after 
          			
          

			
			
			
		
          



							
          
				相關習題
			
          	
						
          
			
          
				科目：初中英語
				來源：期中題
				題型：單選題
			
          
									
          Mr Green was watching TV ______ someone knocked at the door. 
          

          [     ]
          A. while 
          B. when 
          C. since 
          D. after 
          

			
          
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