I play football with my friends on Sundays.( 对划线部分提问)(划线部分是on Sundays)

问题描述:

I play football with my friends on Sundays.( 对划线部分提问)(划线部分是on Sundays)

When do you play football with your friends?正确答案却是How often
为什么答案不正确呗,