[单选题]It( ) be the postman at the door. It's only six'o clock in the morning.
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2023-10-27 16:24:07
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[单选题]It( ) be the postman at the door. It's only six'o clock in the morning.

A.mustn’t
B.can’t
C.won’t
D.needn’t
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西南科技大学

英语口语

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