【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】

D　[考查虛擬語氣。句意：不可能是郵遞員在門口，才六點鐘呢。mustn't 禁止，不允許；can't 不可能；won't 不愿意，就是不，偏不；needn't 不需要。]

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