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           My sister has learnt English _________.
          A．for twelve years ago
          B．since she was four
          C．twelve years ago
          D．a(chǎn)t the age of four
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查現(xiàn)在完成時(shí)的時(shí)間狀語(yǔ)。由謂語(yǔ)動(dòng)詞has learnt可知，應(yīng)用表示一段時(shí)間的時(shí)間狀語(yǔ)，A項(xiàng)表達(dá)錯(cuò)誤；C、D兩項(xiàng)用于一般過(guò)去時(shí)，所以答案選擇B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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