--Look! It ________ be Jack on the playground.

--It ________ be him. Because I saw him enter the school library just now.


  1. A.
    must；mustn't
  2. B.
    can；can't
  3. C.
    may；mustn't
  4. D.
    must；can't
D
must表推測判斷“一定”，而在否定句中表推測判斷都用“can't”。
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