What happen...What's the matter ...What's wrong .的用法~后面+什么?

问题描述:

What happen...What's the matter ...What's wrong .的用法~后面+什么?
He has learnt a lot______his teacher?
a,about b,form c,by d,with
求show off ,show up ,show around,show in 四个词组的意思?

A
他得知了很多关于他老师的事情 learn about 得知
What's the matter 和What's wrong意思一样
show off炫耀
show up 出现
show in 领进门