问题标题：
ItoldSallyhowtogetthere,butmaybeI()forhere.a.musthavestudiedb.mightstudyc.shouldhavestudiedd.wouldstudy
问题描述：
ItoldSallyhowtogetthere,butmaybeI()forhere.a.musthavestudiedb.mightstudy
c.shouldhavestudiedd.wouldstudy
柯文贡回答：
答案选c.shouldhavestudied
【解析】should/oughtto+have+done表示“本来应该做某事,但实际上没有做”.D错在没有用这种完成式.
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