题目内容
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
答案:B
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题目内容
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