It is no wonder you were late.这句中为什么后面的主语从句省略了that?

问题描述:

It is no wonder you were late.这句中为什么后面的主语从句省略了that?
主语从句不是不可以省略that吗?

它是个主语从句,
一般that不省,我们也不赞成省,但在非正式英语中它可以省.
总之,做题目时不要省.