—Look! The lights in the teachers’ office are still on. Is Mr. Li working?
—No. It _______ be Mr. Li. I saw him leave just now.
| A．may not | B．mustn’t | C．can’t | D．needn’t |
—Look! The lights in the teachers’ office are still on. Is Mr. Li working?
—No. It _______ be Mr. Li. I saw him leave just now.
| A．may not | B．mustn’t | C．can’t | D．needn’t |
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