问题补充:
— do you water the flowers?—Twice a day.
A. How many
B. How many times
C. How often
D. How soon
答案:
A. How many
B. How many times
(答案→)C. How often
D. How soon
解析:How many多少个;How many times多少次;How often 多久一次;How soon多久。根据下文,一天两次。可知上文问的是,你多久浇一次花?故选C。