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				31．--What is Bob doing now?--He           his lessons．The exam  is coming．A．did           B．does          C．to do           D．is doing			【查看更多】
			


		
           
          


		
          
		
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          --What is Bob doing now?
            
          --He _________ his lessons．The exam is coming．
            
          A．did               B．does              C．to do                D．is doing
          

			
          
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