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– ______ do I have to take the medicine?
– Three times a day, after meals.
A.How longB.How farC.How oftenD.How soon
C

试题分析:句意:-我应该多长时间吃一次药?-一天三次,饭后。根据这个情景中的回答three times a day,可知,这里是询问吃药的频率,即多久吃一次,提问频率应该用how often。how long 多长时间,对一段时间提问;how far 多远,提问距离;how soon 多久,多快;how often 多久一次。故选C。
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