问题补充：
— do you update your micro blog (微博)?
—Twice a week.
A. How long
B. How often
C. How many times
D. How soon
答案：
A. How long
(答案→)B. How often
C. How many times
D. How soon
解析：四个选项分别表示多长、多久一次，问频率、多少次和多久。根据答语一周两次可知前面问的是频率,选B.
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