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          The light will be thrown ______ the cause of cancer by research that is now in progress.
          A．toB．uponC．in D．for
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查介詞的用法。句意“正在進(jìn)行的研究將對癌癥的起因進(jìn)行解釋。”throw light on/upon sth.“解釋，闡明”。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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