---do you go to the park ?-Once a month .A. How longB. How oftenC. How manyD. How much

问题补充：

---do you go to the park ? ---Once a month .

A. How long

B. How often

C. How many

D. How much

答案：

A. How long

(答案→)B. How often

C. How many

D. How much

解析：句意：你多久去公园一次？一人月一次。how often问频率，how long问长度或者时间多久，how many问数量，how much问价格。故选B.