It ________ be the postman at the door.It's only six o'clock.( 2011·江西)
| 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.( 2011·江西)
| A．mustn't | B．can't | C．won't | D．needn't |
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