单选题 Ms. Adams is the ______ who picked up the packet of promotional materials that came yesterday.

【正确答案】 A

【答案解析】[语法] 代替单数名词的代词one
[错误答案] 空白处可以与the搭配使用的除了代词以外，还有(C)others。但是主语Ms. Adams是一个人，所以是错误答案。