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          Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
          A．when　B．before
          C．in case　D．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查狀語從句。句意：很多年輕人不努力，當機會失去的時候才后悔。他們認識到這一點的時候已經(jīng)太遲了。when意為”當……的時候”，根據(jù)句意可知，選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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