Question

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

Answer 1

B

本题可采取增元法。把句子的后半部分补全为：for he needs to have actual knowledge on which he bases his thinking .   base on：建立……基础上。如Parents owe their children a set of solid values around which to build their lives。故选B。