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          They tried several times to       the problem, and in the end they succeeded.
          A．give upB．work outC．look throughD．think of
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          本題的含義應(yīng)該是他們幾次嘗試解決這個問題，最后成功了，work out表示解決的意思，與句意較符合，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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