without facts ,we can not form a worthwhile opinion,接上for we need to have factual knowledge ——our thinkingA which to be based onB upon which to baseC which to base uponD to which to be based

问题描述:

without facts ,we can not form a worthwhile opinion,
接上for we need to have factual knowledge ——our thinking
A which to be based on
B upon which to base
C which to base upon
D to which to be based

B

选B。
we need to have knowledge upon which to base our thinking.
实际上,可精简为:we base our thinking upon knowledge. 思想建立在知识的基础上。
btw, for means because here.

选B,without facts ,we can not form a worthwhile opinion,for we need to have factual knowledge upon which to baseour thinking.后半句的正常语序为:for we need to baseour thinking upon (on)factual know...