【題目】

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: 門外不可能是郵遞員, 現(xiàn)在才六點(diǎn)。本題考查情態(tài)動(dòng)詞的用法。A: 不可以, 禁止; B: 不可能; C: 不愿意; D: 不必。根據(jù)句意答案:為B項(xiàng)。

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