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          Because of too many differences between the two sides,  a lot of questions are still left ________.
          A in the air      B on the air         C by the air      D through the air 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          本題考查詞組搭配。In the air 意思是“（計劃等）未決定的”；on the air 意思是“在廣播中”；C、D不正確。根據(jù)句意“很多問題還未解決”，故A正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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