问题
选择题
--- ________ have you kept the book ?
--- Since last Month. I ________ return it to the library today or I can’t borrow one next time.
A．How often; must
B．How long; have to
C．How soon; have to
D．When; must
答案
答案：B
题目分析：句意：你借这本书多久啦？自从上个月。今天我得还给图书馆，否则我下次不能借。根据答语Since last Month可知该用How long提问，所以选B。
