题目内容
－________ must I take this medicine every day?
－Three times a day.
[ ]
A．How long
B．How often
C．How far
D．How soon
答案：B
解析：
解析：
|
就表示频率的词提问用 how often；how long就多长时间提问；how far就路程提问；在一般将来时里，就一段时间提问用how soon. |
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