we need to have factual knowledge——our thinkng为何要填 on which

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we need to have factual knowledge——our thinkng为何要填 on which to base
已知定语从句还原为base our thinking on factual knowledge 可是为什么改为疑问句介词会在which 的前面请详述相关知识点

ase ...on...把……建立在……的基础上
定语从句还原就成了base our thinking on factual knowledge
定语从句介词前置
定语从句里,当从句的谓语动词是不及物动词,而关系代词又要在从句里做宾语时,这个不及物动词要带相应的介词.正常的语序是,该介词是紧跟在不及物动词后面的,但有时为了平衡句子的结构,习惯将介词放在关系代词的前面,叫“介词前置”.但这不是硬性规定的,也可以不前置.
另一方面,有些介词是与不及物动词紧密相连的,不能分开,如look for ,look after ,look at,get on（上车）,get off（下车）等,就不能前置.
所以,当你不清楚能不能将介词前置时,最好还是不要前置.
此外,还要注意,介词一旦前置,则关系代词要用宾格（原来是that的要改为which,原来用who的改为whom.）

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