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---I think Helen is at home.

---No, she    be at home, for she phoned me from the airport just five minutes ago.

A.mustn't           B.needn't           C.can't             D.dared not

 

【答案】

C

【解析】

试题分析:句意:我想海伦应该在家里。不,她不可能在家里,因为她刚刚五分钟前还从机场给我打电话了。can’t不可能,用在否定句中表示对事情的强烈的否定推测。故选C

考点:情态动词表推测

点评:情态动词是高考的热点,must表示强烈的肯定推测,意为“一定”;can’t表示强烈的否定推测情态动词。意为“不可能”,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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