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				21．---           are the Olympic Games.do you know?  ---Every four years．  A．how soon       B．how far    C．how long       D．how often			【查看更多】
			


		
           
          


		
          
		
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          ---__________ are the Olympic Games，do you know?
            
          ---Every four years．
            
          A．how soon    B．how far    C．how long    D．how often
          

			
          
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