问题
选择题
It ________ be the postman at the door.It's only six o'clock.( 2011·江西)
A．mustn't
B．can't
C．won't
D．needn't
答案
答案：D
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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