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          —People often don't appreciate what they have, do they?
           —No, _________ they lose it.
          A．ifB．a(chǎn)fterC．untilD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析: 句意：——人們經(jīng)常不會感激他們所擁有的，是嗎？——是的，直到失去它們的時候。A如果；B在……之后；C直到……時候；D當……時候。根據(jù)上句可知此處是省略，補充完整應該是people often don’t appreciate what they have until they lose it .答案選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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