问题
选择题
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
答案：B
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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
答案：B