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          Not until I went through his paper _________ what rapid progress he had made in writing.
            
             A. I did find  B. did I find        C. I had found     D. was I found
          			
          


			
		
          
		
				
          
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          It was ______ the old worker came that we______ the experiment.
            
           A．until；didn’t begin      B．not until; began   C．until; began      D．not until; didn’t begin
          

			
          

			
          
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