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          — How come your father can read books in German?
          — Well, he _____ on a project with some German engineers for 3 years when he was young. 

          A. worked 
          B. was working 
          C. had worked 
          D. would work 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
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          --- Well, he____on a project with some
German engineers for 3 years when he was young.
          


          
 
          
  
  
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