--dose it take to get to the airport from here ?-- It takes half an hour.A. How longB. How

问题补充：

--dose it take to get to the airport from here ?

-- It takes half an hour.

A. How long

B. How soon

C. How far

D. How often

答案：

(答案→)A. How long

B. How soon

C. How far

D. How often

解析：How long多长；How soon多久；How far多远；How often多久一次。根据答语，用了半个小时。可知上文问的是时间长短，故选A。