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          — This returned scientist has become one of the top experts in his field. 
          — Yes, I know him very well. He once _____ in South America with wild animals for eight years. 

          A. has worked 
          B. worked 
          C. had worked 
          D. has been working 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				B				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				相關(guān)習(xí)題
			
          	
						
          
			
          
				科目：高中英語(yǔ)
				來(lái)源：0111    期中題
				題型：單選題
			
          
									
          — This returned scientist has become one of the top experts in his field. 
          — Yes, I know him very well. He once _____ in South America with wild animals for eight years. 
          

          [     ]
          A. has worked 
          B. worked 
          C. had worked 
          D. has been working 
          

			
          
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