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-----_______do you take the medicine?
-----Three times a day.
A.How long      B.How far      C.How often
C

试题分析:句意:---你多长时间服一次药?每天三次。How long:多长时间,提问时间长度,How far:多远,提问距离, How often多长时间,提问频率。根据句意可知选C。
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