—Doctor, ____________should I take this medicine?
—Twice a day.
A. what time         B. how much        C. how often
C

試題分析：句意為：---醫(yī)生，我應(yīng)該多久服一次這個(gè)藥？---每天兩次。what time ：提問(wèn)時(shí)間，什么時(shí)候； how much：提問(wèn)數(shù)量、價(jià)格多少， how often：提問(wèn)動(dòng)作發(fā)生的頻率，多久一次。根據(jù)語(yǔ)境可知應(yīng)選C。
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