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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)是過去完成時(shí)，前面是過去時(shí)，因此從時(shí)間概念上看應(yīng)該是since．				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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