It is high time that someone()you how to behave yourself

问题描述:

It is high time that someone()you how to behave yourself
a,taught b,teaches c,shall teach d,will teach为什么选a

亲,这是虚拟语气的固定用法.
It is high time that...后面接过去式,表示是该发生什么什么的时候了.