It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句
问题描述：
It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句
答
都不是
it is high time that固定句式
答
语法书上把他当定语从句的
that可以省略
答
虚拟语气,不是强调也不是主语从句
答
定语从句，先行词是time