问题补充:
— Can you tell me it is from here to the history museum?
— It’s about half an hour’s walk.
A. how much
B. how often
C. how long
D. how far
答案:
A. how much
B. how often
C. how long
(答案→)D. how far
解析:D 根据答语“步行大约半小时”可知,问的是距离,对距离提问用how far。how long是对时间提问;how often问频率;how much问价钱。