It ___ be the postman at the door. It’s only six o’clock.
A．mustn’tB．can’tC．won’tD．needn’t
B

這題考查情態(tài)動(dòng)詞的用法：can’t是表示猜測(cè)，不可能，句意是：現(xiàn)在不可能是郵遞員，才6點(diǎn)。選B。
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