Without facts, we can’t form a correct opinion, for we need to have actual knowledge _______ our thinking.

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

Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.

Without facts, we can’t form a correct opinion, for we need to have actual knowledge________ our thinking.

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

C. on which to base                              D. which to base

Without facts, we can’t form a correct opinion, for we need to have actual knowledge _______ our thinking.

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

C. on which to base                D. which to base