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______for his expert advive,John is often asked to help othe

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______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?
要用被动,be known for固定词组,因…而众所周知