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           In the experiment we kept a watchful eye ________ the developments and recorded every detail. 
          A．inB．a(chǎn)t C．forD．on
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D 
          因?yàn)閗eep an eye on…是習(xí)語，意為“密切注視…”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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