-- is your house from the factory?It’s about twenty minutes’ walk.A. How longB. How soo

问题补充：

-- is your house from the factory? --It’s about twenty minutes’ walk.

A. How long

B. How soon

C. How often

D. How far

答案：

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。