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          _______ we got to the station, the train had left already.
          A．IfB．UnlessC．SinceD．When
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：考查連詞：A. If如果，B. Unless除非，C. Since自從，既然，D. When當(dāng)…時(shí)候，句意：當(dāng)我們到車站的時(shí)候，火車已經(jīng)離開了。選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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