Look!The man at the school gate _________ be our headmaster．He is always standing there to welcome us every morning．
No，it _______ be him．He is holding a meeting in the office now．（ ）
| A． |
must； can't |
| B． |
must； mustn't |
| C． |
can't； mustn't |
Look!The man at the school gate _________ be our headmaster．He is always standing there to welcome us every morning．
No，it _______ be him．He is holding a meeting in the office now．（ ）
| A． |
must； can't |
| B． |
must； mustn't |
| C． |
can't； mustn't |
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