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with facts ,we can not form a worthwhile opinion ,for we nee

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with facts ,we can not form a worthwhile opinion ,for we need to have factural konwledge ____our thiniking.
A.which to be based on B.upon which to base C.which to base up on D.to which to be based 解释得通俗易懂点啊、、
with facts ,we can not form a worthwhile opinion ,for we nee
选B.这道题有个固定短语:base sth upon sth.将此定语从句还原为we need to have base our thiniking on factural knowledge,而factural knowledge是先行词,which又指代factural knowledge,所以用which来引导定语从句.同时,定语从句中的介词可以放在关系词前或后面,所以将upon放到which之前,故选B.