---How long are you staying?
---I don’t know. .
A. That’s OK.
B. Never mind
C. It depends
D. It doesn’t matter
网友回答
A. That’s OK.
B. Never mind
(答案→)C. It depends
D. It doesn’t matter
解析：考查情景交际。That’s OK. 不客气；Never mind不介意；It depends 视情况而定；It doesn’t matter没关系。句意：你要呆多长时间？我不知道。视情况而定。所以选C。