As it turned out to be the most important meeting in the year, you so casually.
A. Shouldn’t dress up
B. shouldn’t have dressed up
C. needn't have dressed up
D. couldn’t dress up
网友回答
A. Shouldn’t dress up
(答案→)B. shouldn’t have dressed up
C. needn't have dressed up
D. couldn’t dress up
解析：
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。