He is a man of great experience,___much can be learned.

问题描述:

He is a man of great experience,___much can be learned.
A.who B.from which C.which D.from whom
知道是选D,但为什么选D,A,B,C为什么不行.

这里考察了一个词组
learn from sb 从某人那学到...
A C可以排除
而B是from which 显然不符合 from sb
sb在这用whom代替前面的man
供参考!这个句子怎么还原He is a man of great experience, much can be learned from him.