---Listen! Peter is singing in the classroom!
---It _____ be him. He has gone back to his hometown.
| A．must | B．mustn’t |
| C．may not | D．can’t |
---Listen! Peter is singing in the classroom!
---It _____ be him. He has gone back to his hometown.
| A．must | B．mustn’t |
| C．may not | D．can’t |
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