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          Every possible means _____. However, nothing can _____ him dying of lung cancer. 

          A. has tried; stop
          B. have tried; keep  
          C. has been tried; prevent 
          D. have been tried; stop 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Every possible means _____. However, nothing can _____ him dying of lung cancer. 
          

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