-- is your school from here?-- About one kilometer.A. How longB. How oftenC. How farD. Whe

问题补充：

-- is your school from here?

-- About one kilometer.

A. How long

B. How often

C. How far

D. Where

答案：

A. How long

B. How often

(答案→)C. How far

D. Where

解析：How long多长；How often多久一次； How far 多远；Where在哪儿。根据下文答语，大约一千米。可知上文提问距离，故选C。