题目内容：

Without facts,we can't form a worthwhile opinion for we need to have factual knowledge( )our(见下方
thinking
A.which to be based on B.which to base upon C.upon which to base
D.to which to be based
该题正确答案应选C,请解释一下原因,说明其他几项为什么不对,谢谢

优质解答

定语从句中介词+关系词的构成方式.There is no chair ON which we can sit.你的例子中,upon=on,来自于 base...on ...,即 “那……作为……的基础”.整句意思“没有事实根据,我们形成不了有用的看法,因为我们要把思维...