--_____,sir?--Just a minute.My friend hasn't turned up yet.A

--_____,sir?
--Just a minute.My friend hasn't turned up yet.
A.What's the matter with you
B.What can I do for you
C.How is it going
D.May I take your order
--Hello,may I make an appointment with Dr.Lee?
--____
A.Sorry,he's busy at the moment.
B.Just a minute.I will call him for you.
C.Certainly.May I have your name?
D.Sorry,he doesn't want to see you.
--Thank you very much for driving me to the airport.--______.
A.With pleasure B.That's all right C.Come on D.Don't mention it.
（with pleasure 不是在帮别人之前回答时用的吗?）