题文
Excuse me，sir．You ________ open the door before the train stops．
| A．mustn’t |
| B．needn’t |
| C．may not |
| D．don’t have to |
Excuse me，sir．You ________ open the door before the train stops．
| A．mustn’t |
| B．needn’t |
| C．may not |
| D．don’t have to |
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