【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
在线课程【答案】B
【解析】
D [考查虚拟语气。句意：不可能是邮递员在门口，才六点钟呢。mustn't 禁止，不允许；can't 不可能；won't 不愿意，就是不，偏不；needn't 不需要。]
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