He goes to see his parents per week?对per week 划线提问怎么写?

问题描述:

He goes to see his parents per week?对per week 划线提问怎么写?
要解释的!别给个空答案!那样别人别挺他!

how often does he go to see his parents?
per week是每个星期,问的是频率,所以用how often