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5.-How ______ you be so stupid as to believe him?
-Sorry,I did go out of my head somehow.(  )
A.couldB.needC.mustD.might

分析 --你怎么这么笨,竟相信了他的话?
--很抱歉,当时不知怎么的,我的确是脑子蒙了.

解答 答案:A.
本句考查情态动词的用法.根据句意"你怎么这么笨,竟相信了他的话"可知,此处表示的是一种吃惊、不相信的语气,而could可以表示惊异、怀疑、不相信等情绪;故选A.need表示需要;must表示主管上的必须,偏偏,偏要,非要;might表示委婉的可能,或许.so+adj.+as to do sth如此…以至于…;go out of my head"我"神经错乱.

点评 对于情态动词要搞清楚每个情态动词的基本和特殊用法,并结合具体句意和语境做出恰当的选择.

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