问题补充:
— do you go to the school library? —Once a week.
A. How often
B. How soon
C. How long
D. How much
答案:
(答案→)A. How often
B. How soon
C. How long
D. How much
解析:A. How often多久一次 B. How soon多久 C. How long多长时间 D. How much 多少,修饰不可数名词;句意:你多久去一次学校图书馆?一周一次。故选A