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           It is diving _____ great speed that often causes serious accidents.
          A．onB．a(chǎn)tC．forD．in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          在英文中表示以……速度，可用介詞at，故本題選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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