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 --你怎么這么笨，竟相信了他的話？
--很抱歉，當時不知怎么的，我的確是腦子蒙了．

解答 答案：A．
本句考查情態(tài)動詞的用法．根據(jù)句意"你怎么這么笨，竟相信了他的話"可知，此處表示的是一種吃驚、不相信的語氣，而could可以表示驚異、懷疑、不相信等情緒；故選A．need表示需要；must表示主管上的必須，偏偏，偏要，非要；might表示委婉的可能，或許．so+adj．+as to do sth如此…以至于…；go out of my head"我"神經(jīng)錯亂．

點評 對于情態(tài)動詞要搞清楚每個情態(tài)動詞的基本和特殊用法，并結(jié)合具體句意和語境做出恰當?shù)倪x擇．

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