根据所给句子的问题选择合适的应答语，注意有一项是多余的。
How long have you been in this hospital?
What happened to your friend last Saturday afternoon?
You haven’t seen him for a long time ,have you?
May I ask you some questions on the accident?
What’s the highest mountain in the world?

A．Qomolangma,of course

B．Sure.You can ask anything

C．For about six years

D．No,we haven’t see each other for 20 years.

E.He broken down a man and he hurt badly.
F.Certainly,no problem.