问题
选择题
--________do you go to the dentist?
--Let me see, twice a year, maybe.
A．How many
B．How much
C．How often
D．How soon
答案
答案：C
题目分析：句意：你多长时间去看一次牙医？让我想想看，也许一年两次吧。twice a year一年两次，表示频率，要用how often来提问，故选C。
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