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________ the beginning of the 19th century did scientists know that all matter is made up of atoms.


  1. A.
    At
  2. B.
    By
  3. C.
    Up to
  4. D.
    Not until
D
not until位于句首,句子须采用倒装语序。
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用所给单词的适当形式填空。
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5. We______(get) ready for a party now.
6. He is a______(luck) boy.
7. Thank you for______(help) me.
8. There are two basketball______(match) tonight.
9. Do you know that girl? She comes from an______(America) city.
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