--How long are you staying? ---I don't know. .A. That’s OKB. Never mindC. It dependsD. It

问题补充：

--How long are you staying? ---I don know. .

A. That’s OK

B. Never mind

C. It depends

D. It doesn matter

答案：

A. That’s OK

B. Never mind

(答案→)C. It depends

D. It doesn matter

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