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          The flu is believed _____ by viruses inside the human nose and throat.

          A. causing 
          B. being caused 
          C. to be caused 
          D. be have caused 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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