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You _____ make any noise while father is sleeping.
A.oughtn’tB.mustn’t
C.ought to notD.don’t have to
B

试题分析:句意:当你父亲在睡觉时,你不准发出任何的噪音。mustn’t表示例行禁止,并非表示推测,而don’t have to表示没有必要做某事,故选B
点评:情态动词
点评:情态动词是高考的热点,情态动词除了表推测外,还可以表达另外的意思,如must理解为必须,由这个词所开头的问句,肯定回答用Yes,you must.否定回答用No,you needn’t或者是No,you don’t have to.注意不用mustn’t,因为mustn’t表示例行禁止的含义。
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