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          —I wonder how much you charge for your services.
          —The first two are free ________ the third costs $30.
          A．whileB．untilC．whenD．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          while是并列連詞，表示對(duì)比，意為“而”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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