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          AIDS is said__________the biggest health challenge to both
men and women in that area over the past few years.
          


           A．that it
is        B．to
be           C．that
it has been    D．to have been
          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          D
          


          【解析】略
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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