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          A man escaped from the prison last night. It was a long time ________ the guards discovered what had happened.

          1. A.
            before
          2. B.
            until
          3. C.
            since
          4. D.
            when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				C
          解析：
          本題要突破定向思維，不是It was a long time before句型，注意空格后面的時(shí)態(tài)是過(guò)去完成時(shí)，前面是過(guò)去時(shí)，因此從時(shí)間概念上看應(yīng)該是since．				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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