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          ________ H7N9 is a deadly virus, it is still safe to eat thoroughly­cooked chicken.
          A．UntilB．While
          C．IfD．Since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          B考察狀語從句。本句中的deadly和safe構(gòu)成了鮮明的對比，由此可知，空格處表示讓步關(guān)系，while有盡管的意思。故B正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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