31. A: Are you free tomorrow evening?
B: Yes. ________________
A: I plan a surprise party for Mary, and I know she will be pleased to see you there.
B: My pleasure. I’ll be there on time.
(A) What’s up?
(B) What date is it?
(C) I have a lot of work to do.
(D) What are you doing today?
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what's up?informal u...