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It is impolite to leave______the meeting finishes.


  1. A.
    after
  2. B.
    before
  3. C.
    until
  4. 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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