Question

【题目】—________ do you brush your teeth?
—Once a day.
A.How often
B.How soon
C.How long
D.How many

Answer 1

【答案】A
【解析】How often 多久一次，常提问频率；How soon 多久，常对一般将来时提问；How long 多长，提问时间或物体的长度；How many 多少，提问可数名词的数量。由答语“一天一次”可知问句问的是频率，故选A。