TPO中的问题

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阿苏曼达
914
2
1.a lot of people still thought tomatoes are poisonous. 我想请问为什么从句用现在时
2.The books have to been in perfect condition of course. They can be marked up or looked use in any way for the full refund.求翻译,重点是marked up 何解
3.So I’d like to know if you be willing to join us as the student's representatives. 从句中为什么是be呢?
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