----Look at the boy running on the playground. Is it David?
---- It ______ be him. I saw him go to the teachers’ office just now.
| A．mustn’t | B．can’t |
| C．may not | D．needn’t |
----Look at the boy running on the playground. Is it David?
---- It ______ be him. I saw him go to the teachers’ office just now.
| A．mustn’t | B．can’t |
| C．may not | D．needn’t |
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