584.  resenters 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
这题选D。
我做了一些类似的题目,有类似的什么......,many of them / many of which;或者是......,one of those / who / whom。