他隔多久去一次图书馆?用英语怎么说
问题描述：
他隔多久去一次图书馆?用英语怎么说
答
How offten does he go to the library?
答
How often does he go to the library
答
How often do he go to the library
答
How often does he go to the library?
答
How often does he go to the library