问题补充:
--- do you practice writing your compositions?
--- Twice a week.
A. How much
B. How long
C. How often
D. How old
答案:
A. How much
B. How long
(答案→)C. How often
D. How old
解析:此题根据回答(一周两次)可知上文是问频率,所给选项中A. How much多少; B. How long多长; C. How often多久一次; D. How old问年龄多大,所以选C。