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          _______ the boy was walking down the street, the UFO landed.
          A．WhileB．AfterC．BeforeD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：當(dāng)這位男孩在街道上散步時(shí)，UFO著陸。While當(dāng)……的時(shí)候；after在···……之后；before在……之前；until直到。所以選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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