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          ________ hard is the key to success. 
          A．To workB．WorkC．WorkedD．Works
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          動(dòng)詞不定式主語(yǔ)，其他詞不能單獨(dú)用作主語(yǔ)，故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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