答案是:所谓的提示词就是时间状语
1.yesterday(morning,afternoon...)thedaybeforeyesterday
2.last+名词(lastweekend,lastyear,lastmonth...)
3.时间段+ago(anhourago,twoyearsago...)
4.时间段+later(twodayslater)
5.固定词组justnow,atthattime等
6.明确的时间状语比如:in2012
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