Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge _____ his thinking .

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

         C．which to be based    D．which to base

 Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge           his thinking .

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

     C．which to be based                                D．which to base

Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge           his thinking .

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

       C．which to be based   D．which to base

Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge          his thinking .

1. A.
   which to be based on
2. B.
   on which to base
3. C.
   which to be based
4. D.
   which to base