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          Never form the habit of smoking because it ________ human beings．
          

          

          [　　]
          

          A．

          does harm with
          

          

          B．

          is harmful to
          

          

          C．

          is harm for
          

          

          D．

          does harmful to
          

          

          			
          


			
		
          
		
				
          
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