网址：http://m.1010jiajiao.com/timu3_id_3003586[举报]
Old Tom is a man of great knowledge, ______ much can be learned.
A. in whom B. about whom C. from whom D. of whom
Old Tom is a man of great knowledge, ________ much can be learned．
A．in whom
B．about whom
C．from whom
D．of whom