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          Several days has passed_______the air crash（空難） happened.
           A.since                  B.after                C.as
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考察介詞。A.自……以來(lái)B.從……以后   C.隨著……、當(dāng)……時(shí)候。根據(jù)題意自從空難發(fā)生以來(lái)，幾天已經(jīng)過(guò)去了。選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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