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				38．--Tom．Why do  you look so tired?--Because I often study late           10 o'clock at night．A．before          B．by            C．until           D．a(chǎn)t			【查看更多】
			


		
           
          


		
          
		
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          --Tom．Why do you look so tired?
            
          --Because I often study late _________ 10 o'clock at night．
            
          A．before              B．by               C．until               D．a(chǎn)t
          

			
          
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