问题补充:
— can I keep the books? —Two weeks.
A. How long
B. How often
C. How far
D. How soon
答案:
(答案→)A. How long
B. How often
C. How far
D. How soon
解析:句意:这些书我可以保存多久?两个星期。how long 就一段时间提问;how often就频率提问;how far 就距离提问;how soon 就“多快,多久”提问;根据后面的two weeks可知,是提问的时间之久,所以用how long;故选A。