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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               
                       
          試題分析： 考查連詞辨析。A 當(dāng)。時候；B 在之前；C 因?yàn)镈 自從。句意 你認(rèn)識這個醫(yī)生多久了。自己三年前他幫我開始。上文提到現(xiàn)在完成，與since引導(dǎo)的一般過去時相呼應(yīng)。故選D項。         
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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