— do you go to the school library? —Once a week.A. How oftenB. How soonC. How longD. How m

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