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          ________ I got on the bus, he got off.
          A．AsB．WhileC．UntilD．Till
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：當我上車時，他下車了。As用作連詞，意為“當……的時候”，故選A。While用作連詞表示對比，后面跟延續(xù)性動詞；故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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