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          There _____ many kinds of birds around here, but now we seldom see them because of the 
          air pollution. 

          A. use to 
          B. use to have
          C. use to be 
          D. are 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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