题目内容：

英语选择题一个：It·s high time the child ___how to behave properly.
A learns
B learning
C to learn
D learned

优质解答

It is high time (that) sb.did sth
固定句型,虚拟语气,“某人该做某事了”
也可以说,It·s high time the child should learn how to behave properly.