问题补充:
—do you write to your parents?
-- Twice a month.
A. How often
B. How many
C. How long
D. How soon
答案:
(答案→)A. How often
B. How many
C. How long
D. How soon
解析:句意:你多久给你的爸爸妈妈写一次信?一个月写两次。How many多少,与可数名词连用;How often 多久一次,How long多长时间,How soon多久,表将来。