thenightbefore与lastnight
下面句子是高中必修4第一单元第一段,请问最后一句话中为什么用thenightbefore,为什么不用lastnight?印象中是间接引语用thenightbefore,直接引语才用lastnight啊.
Itis5:45amandthesunisjustrisingoverGombeNationalParkinEastAfrica.FollowingJane'swayofstudyingchimps,ourgroupareallgoingtovisitthemintheforest.Janehasstudiedthesefamiliesofchimpsformanyyearsandhelpedpeopleunderstandhowmuchtheybehavelikehumans.Watchingafamilyofchimpswakeupisourfirstactivityoftheday.Thismeansgoingbacktotheplacewhereweleftthefamilysleepinginatreethenightbefore.