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          ---_____ did your uncle leave his hometown?
          ---He ________ for nearly twenty years.
          A．When; has leftB．When; has been away
          C．How long; has left D．How long; has been away
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          第一空，因為后面給的動詞是短暫性動詞，所以用特殊疑問詞when ，因為how long 與延續(xù)性動詞連用，而后一個空，后接for+一段時間，所以特殊疑問詞需要是延續(xù)性的，故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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