in a day/ yearin two weeks/ a fortnight
after是一个介词,后面应该跟doing sth.或宾语从句 1L的work变成working After working hard all day yesterday,I felt very tired.
春节一天之后A day after the Spring Festival春节一天之后A day after the Spring Festival春节一天之后A day after the Spring Festival
两个都对,in表示在多久以后是,用于将来after a year, a few years later two weeks later用于过去
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