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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
本題考查“疑問(wèn)詞+不定式”的用法。把句子的后半部分補(bǔ)全為：for we need to have actual knowledge on which we base our thinking。  base… on…把…建立……基礎(chǔ)上。
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