(2011·江西高考)It ________be the postman at the door.It's only six o'clock.
A．mustn'tB．can't
C．won'tD．needn't
B
選B　考查情態(tài)動詞。句意：門口不可能是郵遞員，(現(xiàn)在)才六點鐘。 對現(xiàn)在的否定推測，由It's only six o'clock.分析可知應用can't(不可能)。mustn't“禁止”， won't“不會”，needn't“不必”，均不合句意。
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