He is a man of great knowledge much can be learned.A. in whomB. about whomC. from whomD.

问题补充：

He is a man of great knowledge, much can be learned.

A. in whom

B. about whom

C. from whom

D. of whom

答案：

A. in whom

B. about whom

(答案→)C. from whom

D. of whom

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