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

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

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