in a few day 划线部分提问?用什么特殊疑问词

问题描述:

in a few day 划线部分提问?用什么特殊疑问词

in a few days 几天后(一般情况用在将来时,这个时候提问用 how soon ”多久之后”)
He will come back in a few days
---How soon will he come back?