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          Every few years, the coal workers _____ their lungs X-rayed to ensure their health. 

          A. are having 
          B. have
          C. have had 
          D. had had 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				B				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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