- Someone is knocking at the door.
- It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t | C．couldnot | D．might; not |
- Someone is knocking at the door.
- It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t | C．couldnot | D．might; not |
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