It is high time they started out是什么从句?这应该是it's time (that) sb did sth的句型,但我有点不清楚这是什么从句,说是主语从句吧,主语从句中的that不可以省略,说是定语从句吧,先行词that 代表前边的ti

It is high time It is high time It is high time that they started out.他们该动身了.It is high time中high是何意?It is high time如何翻译 it is high time的high是什么意思 it is high time that . It is time(high time)that .It is time( high time)that it is high time that的用法 It is high time that sb.should do 其中 high it is high time to 例句：It is high time to protect the animal It is high time that they started setting off on a trip ,这句话中为什么要用started , It is high time that something were done upon it. It is high time that something were done upon it high是什么意思在It is high time you had a rest ,high 相当right吗 It is high time 怎么用啊,后面接什么? It is high time that的具体用法? it is high time后面加什么形式的动词 It is high time that +从句,前面的如何翻译? 翻译It is high time that we solved the problem