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				 All possible means      . However, nothing can    him  dying of lung cancer.A．has tried; stopB．have been tried; keepC．has been tried; preventD．have been tried; stop			【查看更多】
			


		
           
          


		
          
		
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          All possible means ________. However, nothing can ________ him dying of lung cancer.
          

          [　　]
          

          A．has tried, stop
          

          B．have been tried, keep
          

          C．has been tried, prevent
          

          D．have been tried, stop
          

			
          
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          All possible means ________. However, nothing can ________ him dying of lung cancer.
          

          [　　]
          

          A．has tried, stop
          

          B．have been tried, keep
          

          C．has been tried, prevent
          

          D．have been tried, stop
          

			
          
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          All possible means _________．However, nothing can _________ him dying of lung cancer．
          

          

          [　　]
          

          A．

          has tried; stop
          

          

          B．

          have been tried; keep
          

          

          C．

          has been tried; prevent
          

          

          D．

          have been tried; stop
          

          

          

			
          
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