[解析]
C C A
W:Can you hold the doors a minute,Mike?I've got a big bag here.
M:Up to the fourth floor?
W:Yes,please.Have you just finished your work?
M:Actually.I finished at lunchtime today because they're replacing our computers.So I've been to the gym this afternoon.
W:Are you going out tonight?
M:No.Are you inviting me somewhere?
W:Oh,no,I've actually spent all day trying to write a history essay and I still haven't finished it.I have to hand it in tomorrow.I started it last week …
M:Sorry.I can't help you with that ...I never enjoyed studying history at school.
W:I don't need any help with the essay.But you can help me by not playing your piano.I just can't stand it anymore.
M:I'm sorry,but nobody's ever complained before.