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          Great changes _____ in our country since twenty years ago. 

          A. have taken place 
          B. have been taken place
          C. took place 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				A				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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