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           - What's wrong with you, Madam?
           - I've lost my valuable painting. But a week had gone by _______ I knew it was missing.
          A．while B．since C．until D．before 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          

          解析試題分析：句意：——太太，你怎么啦？——我丟了我的貴重的油畫。但是一周過去了，我才知道它丟了。A. while 當(dāng)……時(shí)候；     B. since 自從；   C. until 直到；   D. before在……之前；。根據(jù)knew，和had gone可知，在知道之前，那幅畫已經(jīng)丟了，故用連詞before。故選D。
          考點(diǎn)：考查連詞的用法。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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