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          It never occurred to humans until the mid-1990s _____ some animals can be cloned. 

          A. where 
          B. that
          C. when
          D. what 
          			
          

			
			
			
		
          



							
          
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          A．occur
          
            		
  
  
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          C．occurred to
          
            		
  
  
          D．occurred
          
            		
 
          

          


           
          

			
          
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