--is it from here to the Capital Airport?Nearly sixty kilometers.A. How longB. How much

问题补充：

--is it from here to the Capital Airport?

--Nearly sixty kilometers.

A. How long

B. How much

C. How often

D. How far

答案：

A. How long

B. How much

C. How often

(答案→)D. How far

解析：根据答语可知询问的是距离，故用how far来提问。