form a worthwhile opinion for we need to have factual knowledge ___ our ...

form a worthwhile opinion for we need to have factual knowledge ___ our ...
This sentence is from an exercise book.The whole sentence is:
Without facts,we cannot form a worthwhile opinion for we need to have factual knowledge ___ our thinking.
The correct answer of the blank is:on which to base
The red colour part make me confused.
I hope somebody could be telling me the structure of the sentence.I can't fully understand such sentences.
请帮我理解从空处开始向後的这个部分
英语人气:506 ℃时间:2020-01-29 12:29:14
优质解答
参考答案:请记得,好朋友的定义是:你混的好,她打心眼里为你开心;你混的不好,她由衷的为你着急.
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