--does your sister practice singing English songs?----Twice a week.A. How soonB. How longC

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。