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 Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge _____ his thinking .
A.which to be based on B.on which to base
C.which to be based D.which to base
B
本题可采取增元法。把句子的后半部分补全为:for he needs to have actual knowledge on which he bases his thinking .   base on:建立……基础上。如Parents owe their children a set of solid values around which to build their lives。故选B。
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