题目内容

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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