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           They will lose the game _______ they try their best.
          A．unlessB．onceC．sinceD．a(chǎn)fter
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意:除非他們盡他們的最大努力，否則他們會(huì)輸?shù)舯荣�。unless 除非，如果不；once 一旦，曾經(jīng)，一次；since自從；after 在…之后。根據(jù)句意可知選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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