题目内容
--Look! It ________ be Jack on the playground.
--It ________ be him. Because I saw him enter the school library just now.
- A.must;mustn't
- B.can;can't
- C.may;mustn't
- D.must;can't
D
must表推测判断“一定”,而在否定句中表推测判断都用“can't”。
must表推测判断“一定”,而在否定句中表推测判断都用“can't”。
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