---Pleasetellme______itwillbetaken,doctor.---Onceeveryfourhours,please.

发布时间:2020-08-07 01:47:27

---Please tell me ______ it will be taken, doctor.---Once every four hours, please.A.whenB.how oftenC.how soonD.how long

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B解析就频度提问用how often。
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