英语语法题（代词）Everyone must wear --- school uniforms to shool.A.o

C
ones 不能接其他名词或别的,只能做主语或宾语
one's one等代词没有所有格形式
their 是形容词性物主代词可以修饰名词
theirs是名词性物主代词不能再接名词theirs=their school unifofms
希望对你有用