---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 |
---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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