--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(cè)判斷“一定”,而在否定句中表推測(cè)判斷都用“can't”。
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