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          (2010·上海)Wind power is an ancient source of energy ________ we may return in the near future.
          A．on whichB．by whichC．to whichD．from which
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考查“介詞＋which”引導的定語從句。表示“重新回到……上”要用return to。which替代的是先行詞“an ancient source of energy”。句意：風能是一種古老的能源，在不久的將來我們可能要重新利用這種能源。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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