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---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.
---No. it ____ be him. He is having a meeting in the office now.
| A£®must; can¡¯t | B£®must; mustn¡¯t |
| C£®can¡¯t; can¡¯t | D£®can¡¯t; mustn¡¯t |
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