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				21．―          ?―Yes.I'm  looking for a pen．A．Can I help you                    B．What are  you doing?C．What do you want to buy              D．What do  you like?			【查看更多】
			


		
           
          


		
          
		
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          — _________?
            
          —Yes，I'm looking for a pen．
            
          A．Can I help you                                         B．What are you doing?
            
          C．What do you want to buy                           D．What do you like?
          

			
          
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