题目内容

---I'm not sure ______ Mr. Wang goes to see his parents.

---Twice a week.


  1. A.
    how long
  2. B.
    how often
  3. C.
    how soon
  4. D.
    how many
B
考查疑问词用法。A项是对时间长度提问,B项是对频度提问,C项是对多久提问,D项是对数量提问。题中答语是频率副词。故选B。
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