----How long are you staying?----I don’t know. A That’s ok.B Never mindC It doesn

问题补充：

----How long are you staying?

----I don’t know.

A That’s ok.

B Never mind

C It doesn’t mind.

D It all depends.

答案：

解析：考查情景交际。“你打算待多久？”“我不知道。”A“没关系”；B“不要紧”；C.It doesn’t matter.“没关系”；D“事情而定”。故选D。