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Alice    be at school because she phoned me from her home a minute ago.

A.mustn’t B.isn’t able to C.may not D.can’t

D

解析试题分析: 表示推测的情态动词有must, could, may, might, can等。“情态动词+不定式一般式” 表示对现在或将来的推测,“情态动词+不定式进行式”表示对正在进行的动作或事情的推测,“情态动词+不定式完成式”表示对过去的推测。
一、must表示推测的用法
must表示推测时,只用于肯定句,表示很大的可能性,意为“一定,准是,必然会”。其否定形式是 can’t/ couldn’t (不可能)。
二、can/could表示推测的用法
1. can表示推测时,多用于肯定句和疑问句。当用于肯定句时,指“有时可能会”,是理论上的可能,其时间意义宽泛不具体。
2. could表示推测时,既可以用于肯定句,又可以用于疑问句。
3. can’t/couldn’t表示推测时,用于否定句,是语气最强的否定推测,意为“不可能,一定不(是)”。
4. can/could在疑问句中表示推测时,含有怀疑或疑问的意味,could比can更不确定。
三、may / might表示推测的用法
1. may / might表示推测时,用于肯定句,表示无把握的推测,意为“可能,或许”。 (might 比may 更加不肯定,更无把握)。
2. may not/ might not表示推测时,用于否定句,表示(无把握的)否定推测,意为“可能/或许不”。根据语境可知此句的含义是Alice肯定不在学校因为一分钟以前她刚刚在家给我打了个电话,因是否定性推测故选D。
考点:情态动词表示推测
点评:此题重点考查情态动词的否定性推测。因此要掌握那些情态动词能表示推测,那些表示肯定性的,哪些是表示否定性的推测。还要理解题干的含义。

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