----_______ do you brush your teeth?
----- Twice a day.
A .How much   B. How often     C. How long
B

試題分析：How much多少錢；How often多久一次；How long多長。根據(jù)下文，一天兩次�？芍衔奶釂柕氖穷l率，故選B，你多久刷一次牙？
點評：該題型是屬于英語考試中的基礎題型，是必考內容。答題前首先要理解每個選項的基本含義及用法，并注意交叉含義間的區(qū)別，然后根據(jù)問答語之間的邏輯關系，以及該疑問詞在句子中承擔的句子成分選擇正確答案。
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