Without facts, we cannot form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
A、
which to be based on
B、
upon which to base
C、
which to base on
D、
to which to be based
【正确答案】
B
【答案解析】
这句话中的，which引导定语从句，先行词为factual knowledge。该定语从句正常语序应为：base our thinking on/upon factual knowledge。
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