___ a day do you feed your pet?Twice a day 用how long,how many times ,还是how often,为啥
问题描述：
___ a day do you feed your pet?Twice a day 用how long,how many times ,还是how often,为啥
答
选how often
how long的意思是多久、多长（时间），how many times的意思是多少次、第几次，how often的意思是多长时间一次
答
How many times, 强调次数。
how long 意思为多久。回答可能会为 15minitus a day
how often 也可以，但是应该去掉a day. How often do you feed your pet? Twice a day.
答
表示频率,用How many times
如果用How often ,应该这样说：How often do you feed your pet?
how long 不能问频率.
答
how many times a day do you feed your pet? 一天喂几次宠物
Twice a day 一天两次
how often 多久 回答的是时间 是 时间 段
how long 多久