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          One of the most important questions they had to consider was ________ of public health. 

          A. what  
          B. this
          C. that  
          D. which
          			
          

			
			
			
		
          



							
          
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          One of the most important questions they
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public health.
          


          
 
          
  
  
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          D．which
          
            		
 
          

          


           
          

			
          
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