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          It is difficult for us to learn a lesson in life______ we’ve actually had that lesson.
            
          A. when                   B. after                   C. since            D. until
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、D
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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