问题补充:
---do you visit your uncle?
---once a week .
A. How long
B. How many
C. How much
D. How often
答案:
A. How long
B. How many
C. How much
(答案→)D. How often
解析:how long多长、多久 ; how many 多少(对可数名词多少进行提问);how much多少(对不可数名词进行提问);howoften意为“多久……次、是否经常”,用来提问在某一特定的时间进行某个动作的次数,答语通常是always,usually,often,sometimes,once/twice a day.本句答语是once a week一周一次,所以答案是D。