one of 有几种用法

1.one of +代词宾格或名词复数
如：one of them
one of the students
2.one of 短语做主语,谓语动词用单数
One of them is good at math.
3.one of +the+形容词最高级+名词复数
one of the longest rivers
再问： one of后好像还有一个加单数名词
再答： 不能加单数名词