When was ___ __ was in 1998 when he was in middle school.that;It.为什么?

问题描述:

When was ___ __ was in 1998 when he was in middle school.that;It.为什么?
为什么用It啊?

when was that? 就是:那是什么时候的事?回答:是98年在中学时! 一个强调句型吧~