they will be back in three days.对划线部分提问划线部分 in three days

问题描述:

they will be back in three days.对划线部分提问
划线部分 in three days

How long will they be back?

when will they be back?

翻译中文是否应是在三天内.

when will they be back ?

How soon will they be back?