单项选择题

Speaker A: Mary won"t be coming to work tomorrow. She"s finally going to the photography exhibit.
Speaker B: Oh, then she managed to get tickets after all.
Speaker A: ______.

A.I"m sure she did
B.After all, she has been trying to get them
C.I think she"ll try to get tickets after work
D.She mustn"t have any difficulty getting tickets