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          The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory. 

          A. on which to base 
          B. which to base on 
          C. to base on 
          D. to be based on 
          			
          

			
			
			
		
          



							
          
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          The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
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          The professor could hardly find sufficient grounds
_____his arguments in favor of the new theory.
          


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on     B．to base on         C．which to base
on    D．on which to
base
          


           
          

			
          
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          The professor could hardly find sufficient
grounds _____his arguments in favor of the new 
          


          theory.
          


          
 
          
  
  
          A．to be based on
          
            		
  
  
          B．to base on
          
            		
 
          
 
          
  
  
          C．which to base on
          
            		
  
  
          D．on which to base
          
            		
 
          

          


           
          

			
          
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          The professor could hardly find
sufficient grounds________ his arguments in favor of the new theory.
          


          A.
on which to base   B. which to base on   C. to base
on     D. to be based on
          


           
          

			
          
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          The professor could hardly find sufficient grounds ________ his arguments in favor of the new theory．

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            on which to base
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          The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory. 
          

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          The professor could hardly find sufficient grounds _____his arguments in favor of the new 
            
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          The professor could hardly find sufficient grounds _____his arguments in favor of the new 
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