有这么一道题:
In election held in 1982, an unusual number of well-known political figures campaigned on behalf of children_____who were running for their office.
答案是 of theirs. 答案解释说,theirs是指,their children.这个是不是和我们平时所说的the rubber of mine...是一个类型的呢,但是如果是的话,那么它后边的那个定语从句who是指什么呢?是指theirs么?但是答案同时还说theirs是their children啊.彻底晕了,希望大家帮我 | 
