问题补充:
--does your sister practice singing English songs?
----Twice a week.
A. How soon
B. How long
C. How far
D. How often
答案:
A. How soon
B. How long
C. How far
(答案→)D. How often
解析:句意:你姐姐多长时间练习唱英语歌曲一次?一星期两次。How often意思是多长时间一次,是询问频率的。How soon的意思是多久、多快,How long的意思是有多久、多长,How far的意思是多远。