问题补充:
— does it take Mary to go to the bubby club?
—Twenty minutes.
A. How far
B. How long
C. How often
D. How much
答案:
A. How far
(答案→)B. How long
C. How often
D. How much
解析:How far多远;How long 多长;How often多久一次;How much多少钱。根据下文,二十分钟。可知上文问的是时间长短,故选B。