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          They ______ on the program for almost one week before I joined them, and now we   
          _______ on it as no good results have come out so far.

          A. had been working; are still working   
          B. had worked; were still working
          C. have been working; have worked     
          D. have worked; are still working
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
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