Without facts, a person can not form a correct opinion, for he needs to have actual knowledge ______his thinking .
A．on which to be basedB．on which to base
C．which to be basedD．which to base
B

試題分析：考查定語從句。base...on...把......建立在......的基礎(chǔ)之上，排除C、D；base的邏輯主語是a person，與base是主謂關(guān)系，不用被動語態(tài)，排除A。故選B。
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