求问一个语法题who和whom啥子区别，

diasor

Presenters at the seminar, one who is blind, will demonstrate adaptive equipment that allows visually impaired people to use computers.

(A)  one who

(B)  one of them who

(C)  and one of them who

(D)  one of whom

(E)   one of which

elsachialee

who是主格，whom是宾格。of whom  介宾短语。
选择D。