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          As your best friend, I will help you all the time _______ you make progress.
          A．ifB．whenC．unlessD．though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          連詞unless意為“除非……如果不……”，“除了……”，多引導一個否定意義的真實條件句，有時也可引導非真實條件旬。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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