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 |