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精英家教網 > 高中英語 > 題目詳情

Not everything must be ready,________?


  1. A.
    is it
  2. B.
    isn't it
  3. C.
    must it
  4. D.
    mustn't it
A
must be表示推測,反意疑問句使用 be動詞。
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Scientists are doing research on whether animals can think and how they think.

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