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          ---I have worked hard at English, but it seems that I haven’t made any progress.
            
          ---Keep on _____ at it, and you will be successful.
            
          A．work            B．working             C．to work           D．works
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、B
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          ---I have worked hard at English, but it seems that I haven’t made any progress.
            
          ---Keep on _____ at it, and you will be successful.
            
          A．work            B．working             C．to work           D．works
          

			
          
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