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          It hasn't been made clear     ________  the new underground line is to be open to traffic.
          A．whenB．that 
          C．whatD．where
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          A 考察名詞性從句。這是when引導(dǎo)的主語從句，it是形式主語。句意：新的地鐵線路何時開放還不清楚。故A正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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