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

锚杆支护巷道中，使用力矩扳手是为了使锚杆（）。

A、便于紧固

B、进一步得到紧固

C、达到规定的扭矩