-- I’m not sure ______ Mr Wang goes to see his parents.-- Twice a week.A、how lon

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问题 -- I’m not sure ______ Mr Wang goes to see his parents.-- Twice a week.

选项 A、how long
B、how often
C、how soon

答案 B

解析考查疑问副词的用法。由答句可知前一句提问的是频率，因此选how often。[A]用于提问时间、长度；[C]用于提问时间，指“多快，多久”。

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--I’mnotsure______MrWanggoestoseehisparents.--Twiceaweek.A、howlon