we r very much surprised that u ( )that rudely last night.

问题描述:

we r very much surprised that u ( )that rudely last night.
1.should behave
2.might behave
3.behaved
4.should have behaved
虚拟语气高手谁能解释一下啊?

4,
虚拟语气might/should/ought to/shall have done