日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

During the Olympic Games many people served as volunteers, ______were young college students.

A. most of them     B. more of which    C. most of whom       D. most of what

During the Olympic Games many people served as volunteers,          were young college

students.

A．most of whom       B．most of which         C．most of them         D．most of what