口语运用。选择句子，补全对话，其中有两项是多余的。
A: Hello?
B: Hello. This is Brenda speaking.  
A: Yes, it is. 
B: I'm calling to ask for advice. These days I'm always tired and I don't sleep well.
A: 
B: Since I started my new job.
A:  
B: About 80 hours .
A: 80 hours? That's a lot. And how much exercise do you take?
B: Not much. I just don't have the time.
A: OK.     You need to work less and find some time to get more exercise.

A．Are you Doctor Smith?

B．How many hours do you work?

C．What’s the matter?

D．How often do you work?

E.Is that Doctor Smith?
F.How long have you had this problem?
G.It seems to me that you work too much.