【题目】He is a man of great experience, __________ much can be learned.
A.who
B.that
C.from whom
D.from which

【答案】C
【解析】考查非限制性定语从句。此处he是先行词，后面是介词+关系代词引导的非限制性定语从句。介词后面跟的关系代词有whom和which，指人用whom引导定语从句。learn from sb，固定短语“从...学到”所以应该用from。所以答案是C。