—How long are you staying? —I don’t know. .A. That’s okB. It dependsC. Never mindD. It doe

问题补充：

—How long are you staying?

—I don’t know. .

A. That’s ok

B. It depends

C. Never mind

D. It doesn’t matter

答案：

A. That’s ok

(答案→)B. It depends

C. Never mind

D. It doesn’t matter

解析：考察交际用语。句意：你打算呆多久？——我不知道。结合语境可知选B，最符合语境。看情况而定。