TodaywasGreatWallDay.Wewokeupniceandearlyandgotreadyforourdayout.Itwasraining.AsIwaledontheGreatWall,itwashardtobelieveitwasacuallyreallyhappening.Itfeltunreal.Wewalked____foraboutonehourbeforeheadingback.A: : 答案:AWHY?

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across是个副词,"在对面""到对面",walk across 是"走到对面"的意思.最后一句可译为:我们用了将近一个小时才走到头,然后向回返."