不好意思，这个题真有点不懂

supermht

194. 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


answer is D,why I cant choose C

lilyan517

"presenters at the seminar"有不是个句子，怎么能用AND去连接呢？呵呵

philixlau

D，one who is blind是非限制定语从句，做插入语