---I think Helen is at home.
---No, she    be at home, for she phoned me from the airport just five minutes ago.
A.mustn'tB.needn'tC.can'tD.dared not
C

試題分析:句意:我想海倫應(yīng)該在家里。不,她不可能在家里,因?yàn)樗齽倓偽宸昼娗斑從機(jī)場(chǎng)給我打電話了。can’t不可能,用在否定句中表示對(duì)事情的強(qiáng)烈的否定推測(cè)。故選C
點(diǎn)評(píng):情態(tài)動(dòng)詞是高考的熱點(diǎn),must表示強(qiáng)烈的肯定推測(cè),意為“一定”;can’t表示強(qiáng)烈的否定推測(cè)情態(tài)動(dòng)詞。意為“不可能”,除了表推測(cè)外,還可以表達(dá)另外的意思,如must理解為必須,由這個(gè)詞所開頭的問句,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?yàn)閙ustn’t表示例行禁止的含義。
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