问题描述：
______for his expert advive,John is often asked to help others with their personal affairs.
____for his expert advice,John is often asked to help others with their personal affairs.
A.Having known B.Being known C.Known D.Knowing 为什么选C 不选A?
____for his expert advice,John is often asked to help others with their personal affairs.
A.Having known B.Being known C.Known D.Knowing 为什么选C 不选A?
问题解答：
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