-- is your house from the factory? --It’s about twenty minutes’ walk.
A. How long
B. How soon
C. How often
D. How far
网友回答
A. How long
B. How soon
C. How often
(答案→)D. How far
解析：本题考查疑问词的用法。Howsoon还要多久，How long示时间的长度，B项表示；How far表示距离“多远” How often表示频率。根据答语“步行大约二十分钟。”可知答案。