问题补充:
— do you go to the zoo with your brother?
—Three times a month.
A. How long
B. How often
C. How old
D. How much
答案:
A. How long
(答案→)B. How often
C. How old
D. How much
解析:句意:你和你哥哥多久去一次动物园?一个月三次。根据答语可知上句是提问频率。A多久,问时间段,B多久一次,C多大了,问年龄,D多少,问价格。故选B.