It______be the postman at the door. It's only six o'clock.
| A．mustn't |
| B．can't |
| C．won't |
| D．needn't |
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It______be the postman at the door. It's only six o'clock.
| A．mustn't |
| B．can't |
| C．won't |
| D．needn't |
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