A:______does he go to the library?B:He goes there once a week.
问题描述：
A:______does he go to the library?B:He goes there once a week.
在横线上填入适当的疑问词
答
"How often "
How often does he go to the library?B:He goes there once a week.
(He goes there once a week.他一星期去那里一次,How often表示多久,整句译为：他多久去一次图书馆?他一星期去那里一次）