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          —How long have you known the doctor ? 
          —         he helped me three years ago.
          A．When　B．Before　C．BecauseD．Since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查情景交際和時(shí)間狀語從句。“你認(rèn)識那個(gè)醫(yī)生多久了？”“自從三年前他幫助我的時(shí)候�！眘ince加含一般過去時(shí)的句子表示一段時(shí)間，主句用現(xiàn)在完成時(shí)。本句的完整形式是I have you known the doctor since he helped me three years ago.故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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