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高考英语50个必备精选句型:since句型
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  (1) Since + S + 过去式,S + 现在完成式
  例句:Since he went to senior high school, he has worked very hard.
  自从他上高中,他一直很用功。
  (2) It is +--- + since +持续性谓语动词(表否定)
  例:It is three years since she lived here. 她已三年不住这儿了。
  (3) It is + --- + since S + 瞬间谓语动词(表肯定)例:It is years since I stopped smoking).我戒烟已经数年了

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