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          Youwillfallbehind others     youwork hard.
          A．ifB．unlessC．thoughD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查連詞的用法。前面是一種假設(shè)的結(jié)果，與后面的條件對(duì)立，應(yīng)使用unless“除非，如果不”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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