one of的幾種用法：
1.one of +代詞賓格或名詞復數
如：one of them
one of the students
2.one of 短語做主語，謂語動詞用單數
One of them is good at math.
3.one of +the+形容詞最高級+名詞復數
one of the longest rivers
one of例句：
I bought one of the leading brands.
我買了幾個暢銷品牌中的一種。
I heard a playback of one of the tapes.
我聽到了其中一盤錄音帶的回放。
I had made arrangements for my affairs to be dealt with by one of my children
我已經安排我的一個孩子處理我的事務。
One of the bags was lost en route.
其中一個包在途中丟失了。
I think that is one of the major ingredients in his success.
我認為那是他成功的主要因素之一。