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          ________ several times，but he still doesn't know how to do it correctly.
          A．Although I've taught him
          B．I've taught him
          C．Having been taught
          D．Having taught
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          although不能與but連用，故不能選擇A。若選C，必須把并列連詞but去掉，這樣就變成了一個(gè)簡(jiǎn)單句，為現(xiàn)在分詞短語(yǔ)作讓步狀語(yǔ)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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