Question

Without facts, we can’t 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

Answer 1

答案：A
解析：

base sth．on/upon…意思是“把……基于；建立在……基础上”，“把我们的思想建立在知识的基础上”，因此base的宾语应为our thinking，故选择A项。