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          　　　it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.
          A．AsB．WhenC．While　　D．Since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          選C。考查狀語從句。句意: 盡管鸚鵡說話是正常的, Einstein, 一只小鳥, 是非同尋常的, 因?yàn)槊慨?dāng)她聽見一個新單詞或者聲音的時候, 她總是重復(fù)說直到掌握。while盡管; as因?yàn)? when當(dāng)……的時候; since既然。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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