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          None of them knew what had happened _________ I told them about it.    
          A．when B．until C．a(chǎn)fterD．though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：when當……時；until直到……才；after在……之后；though雖然，盡管。直到我們告訴他們，他們在知道發(fā)生了什么事。短語not……until直到才，本句中none表示否定含義，故選B.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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