Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.

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

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

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 cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.

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

C．on which to be based                    D．on 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