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                ---What are you busy with ?
          --- We are carrying out a research ____ the causes of cancer.
          A．intoB．ontoC．toD．in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查介詞：do/carry out research into/on對(duì)…做研究，句意：--你在忙什么？--我們?cè)谧鲆粋�(gè)關(guān)于癌癥原因的研究。選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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