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Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.
A.which to be based onB.on which to base
C.which to base onD.which to base
B
本题考查“疑问词+不定式”的用法。把句子的后半部分补全为:for we need to have actual knowledge on which we base our thinking。  base… on…把…建立……基础上。
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