问题
选择题
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
答案
答案：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。