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				24．---Hi,Joan．I haven’t  seen you for weeks．What            recently?  ---Carrying on some research  on wildlife．  A．have you been doing B．have you done C．Were doing  D．did you do			【查看更多】
			


		
           
          


		
          
		
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          ---Hi,Joan．I haven’t seen you for weeks．What __________ recently？
            
          ---Carrying on some research on wildlife．
            
          A．have you been doing    B．have you done    C．Were doing    D．did you do
          

			
          
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