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【题目】

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

【解析】句意: 门外不可能是邮递员, 现在才六点。本题考查情态动词的用法。A: 不可以, 禁止; B: 不可能; C: 不愿意; D: 不必。根据句意答案:为B项。

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