Without facts,we cannot form a valuable opinion,for we need

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/09/23 19:17:56

Without facts,we cannot form a valuable opinion,for we need to have factual knowledge____our thinking.
1.which to be based on
2.which to base upon
3.on which to be based
4.upon which to base
请选择,并帮忙恢复语序,谢谢!

4 upon which to base
首先根据英语从句的使用习惯,如果分句中的词组不是具有与字面意义不同的特殊意义或是非常固定不能拆开（如：take care of,look down upon）的话,一律吧词组中的介词放到关系代词前.所以1和2排除
其次,本句的主语是人,所以原语序应该是we need to base our thinking upon factual knowledge.放在从句中直接语序变化就行了,不需要再变成被动.
最后,base sth on 和upon 是一样的.

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