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				10．          scientists have done a lot of research on Aflu.there are still some cases for  further study．A．As          B．Once         C．If          D．Although			【查看更多】
			


		
           
          


		
          
		
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          ________ scientists have done a lot of research on A（H1N1）flu，there are still some cases for further study．
            
          A．As        B．Once        C．If         D．Although
          

			
          
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