题目内容

It is impolite to leave             the meeting finishes.
A．afterB．beforeC．until D．while
B
本题考查的连词的使用。本题的含义为在会议结束之前离开是不礼貌的。Before为在……之前的含义，与本题的含义相符；而after为在……之后的含义，until为直到……为止的含义，while为当……时候的含义，后三者与本题的含义不符，故本题选B。
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