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          ---Nanjing develops so fast. A fourth underground line is being built.
           ---That’s true. It __________ a lot already.
           A. changes    B. changed    C. has changed    B. will change
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          already是現(xiàn)在完成時的標(biāo)志詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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