问题补充：
–Kate, do you knowit is from here to the gym.
–About twenty minutes’ walk.
A. How far
B. how long
C. How soon
D. How often
答案：
(答案→)A. How far
B. how long
C. How soon
D. How often
解析：句意：--凯特，你知道这儿到体育馆多远吗？--大约20分钟的步行。A多远 B多久 C什么时候 D多久一次；这里的答语是对路程的描述。故选A.
