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          I coutdn't have got to the meeting on time____________ an earlier train.
            
          A. if I had not caught　　　　　　  B. unless I had caugh
            
          C. if ! did not catch　　　　　　　 D. unless I caugh
              
           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
                  
          if．．．not和unless有時也不能互相替換。unless不能用于“由于未發(fā)生B而發(fā)生A”的句子里，unless常用來引導一個談及過去的事后的想法，unless從句跟著主句，通常用破折號而不是逗號將它與主句分開。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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