It's high time you ___ your test paper now.

问题描述:

It's high time you ___ your test paper now.
A.hand in
B.handed in
C.would hand in
D.musht hand in
解释一下high time是什么意思!

B.handed in
It is time sb did 是固定搭配.
high time是一种强调,意思就是“就是这个时刻”
high 在这里的用法有点像very,表示强调.