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				21．一      have you stayed in  Shanghai?    一For about two months．   A．How often    B．How long       C．How soon       D．How far			【查看更多】
			


		
           
          


		
          
		
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          一______have you stayed in Shanghai?
            
          一For about two months．
            
          A．How often          B．How long             C．How soon              D．How far
          

			
          
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