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As it turned out to be the most important meeting in the year, you ____ so casually.
A.Shouldn’t dress upB.shouldn’t have dressed up
C.needn't have dressed upD.couldn’t dress up
B

试题分析:考查情态动词。从语境可知此处是讲述过去的事情,所以应该用情态动词+have done,故排除A,D选项,needn’t have dressed up“本来没必要这样穿戴打扮”,而shouldn’t have dressed up “本来不应该这样穿戴打扮”,根据语境判断B选项正确。句意:这次会议结果成了一年中最重要的一次会议,你真不应该穿的那样随便。
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