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          【題目】（2016·浙江）Scientists have advanced many theories about why human beings cry tears, none of ________has been proved.
          A. whom B. which
          C. what D. that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】B
          【解析】試題句意：關(guān)于人類為什么哭的時候會流淚，科學(xué)家已經(jīng)提出了很多理論，沒有一個被證明了。使用定語從句，先行詞是theories，指物，定語從句中用“代詞+介詞+關(guān)系代詞which”引導(dǎo)。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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