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