---_____must I take this medicine every day? 
--- Three times a day.
A．How longB．How oftenC．How farD．How
B
回答語(yǔ)是每天三次的意思，表示的是頻率，對(duì)此提問(wèn)用how often，故選B，how long對(duì)長(zhǎng)度提問(wèn)，how far對(duì)路程提問(wèn)，how對(duì)方式提問(wèn)。
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