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          _A Chinese runner,Liu Xiang,rushed to the ending line _______a surprising speed.
          A．a(chǎn)tB．byC．throughD．with
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查介詞。at...speed是固定的介詞搭配，意思是“以……的速度”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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