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：

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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