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          ---We can't be successful _____  we keep on working hard.
           ---I agree with you.
          A．ifB．becauseC．unlessD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          連詞unless意為“除非……如果不……”，“除了……”，多引導(dǎo)一個(gè)否定意義的真實(shí)條件句，有時(shí)也可引導(dǎo)非真實(shí)條件句。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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