问题描述：
选择during the Olympic Games many people served as volunteers,( )were young colleg
during the Olympic Games many people served as volunteers,( ) were young college students.
most of them?
most of which?
most of whom?
most of what?
during the Olympic Games many people served as volunteers,( ) were young college students.
most of them?
most of which?
most of whom?
most of what?
问题解答：
我来补答展开全文阅读