(·江西高考)It be the postman at the door.It's only six o'clock.A. mustn'tB. can'tC. won'tD

问题补充：

(·江西高考)It be the postman at the door.Its only six oclock.

A. mustn

B. can

C. won

D. needn

答案：

A. mustn

(答案→)B. can

C. won

D. needn

解析：选B考查情态动词。句意：门口不可能是邮递员，(现在)才六点钟。 对现在的否定推测，由Its only six oclock.分析可知应用can (不可能)。mustn “禁止”， won “不会”，needn “不必”，均不合句意。