--________do you go to the dentist?
--Let me see, twice a year, maybe.
A．How manyB．How muchC．How oftenD．How soon
C

試題分析：句意：你多長時間去看一次牙醫(yī)？讓我想想看，也許一年兩次吧。twice a year一年兩次，表示頻率，要用how often來提問，故選C。
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