根据答语,用适当的疑问词（组）填空
问题描述：
根据答语,用适当的疑问词（组）填空
---___ ___ do you go to the concert?
-- Once a month.
答
How often
根据答语,用适当的疑问词（组）填空
---___ ___ do you go to the concert?
-- Once a month.
How often