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1)I don't buy it.我才不相信。
2)You can't be serious! 开玩笑的吧?
3)I can't believe it.我简直无法相信。
4)Believe it or not. 信不信由你。(不管你信不信)
5)I doubt it.我深表怀疑。
6) Are you sure about this? 你肯定吗?
7)Are you kidding me?你在跟我开玩笑?