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           It’s widely known that you won’t achieve success _____ you work hard.
          A．unlessB．whetherC．ifD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：unless除非，whether是否，if如果，是否，until直到。it’s widely known that眾所周知。句意：眾所周知，除非你努力工作否則你不會(huì)取得成功。故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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