【題目】Without facts, we can’t form a correct opinion, for we need to have actual knowledge ________ our thinking.

A. which to be based on B. on which to base

C. which to base on D. on which to be based

【答案】B

【解析】考查定語從句。句意：沒有事實作為依據(jù)，我們無法形成正確的觀點，因為我們需要依據(jù)事實來思考問題。用不定式作定語修飾前面的名詞，構(gòu)成have sth to do，不定式用主動表被動，故A/D不錯誤的。如果用“疑問詞+不定式”作定語，那么不定式中的介詞要放在疑問詞之前。該句也可寫成：...for we need actual knowledge to base our thinking on，故選B。

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