问题
选择题
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
答案
答案：C
base our thinking on actual knowledge “将我们的思维建立在实际的知识基础之上” , 此处为不定式短语作定语,修饰knowledge .