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				     we are doing has never been done before.  A. That      B. Which      C. whether      D. What			【查看更多】
			


		
           
          


		
          
		
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          ______ we are doing has never been done before.
            
              A. That               B. What
            
          C. Which              D. Whether
          

			
          
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          _______ we are doing has never been done before.
            
              A. That               B. What
            
              C. Which              D. Whether
          

			
          
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          _______ we are doing has never been done before.
            
          A. That　　　　　　　　　　  B. What
            
          C. Which　　　　　　　　　　 D. Whether
              
           
          

			
          
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          ____we are doing has never been done before.
           A. That  　　  B. Which　　　  C. whether　　　　　  D. What
              
           
          

			
          
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          _______ we are doing now has never been done before.?
            
          A. That B. What?
            
          C. Which D. Whether?
          

			
          
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