一are you staying in Tibet?—Just for four daysA. How farB. How muchC. How long D. How soon

问题补充：

一are you staying in Tibet?

—Just for four days．

A. How far

B. How much

C. How long

D. How soon

答案：

A. How far

B. How much

(答案→)C. How long

D. How soon

解析：How far多远；How much 多少钱；How long 多长；How soon多久。根据下文，只有四天，可知上文提问时间长短，故选C。