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          This robot is supposed to save a lot of labor, but it remains a problem if it ______.
          A．isB．savesC．doesD．has
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          do(es) 是代動(dòng)詞，用來代替上文save a lot of labor。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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