—______ do you write to your pen friend?

试题详情及答案解析: —______ do you write to your pen friend?
—Once a week.
A. How long B. How soon C. How ofte; 答案：C; 试题分析：句意：--你多久给你的笔友写一封信？--一周一次。How long多长时间；How soon多久以后；How often多久一次；结合句意，故选C
考点：考查疑问词的用法。