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          The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
          A．whileB．when
          C．a(chǎn)sD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          解析　when此處為并列連詞，相當(dāng)于at that time，可譯為“這時(shí)(突然)……”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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