---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t |
| C．couldn’t | D．may not |
---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t |
| C．couldn’t | D．may not |
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