单项选择题

Speaker A: I have two tickets for the concert tonight. Would you like to come? Speaker B: ______
A.I'd love to, but I promised my mother I'd take my sister to a show.
B.Really? When did you buy the tickets?
C.Why do you ask me to go with you?
D.I can't because actually I'm not very keen on concerts.

A.I'd
B.
B.Really?
C.Why
D.I
E.