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David knocked at the door for nearly half an hour______Mary opened it, unwilling.


  1. A.
    when
  2. B.
    while
  3. C.
    until
  4. D.
    before
D
试题分析:考查状语从句中的连词。句意:David敲门敲了将近半个小时Mary才不情愿地打开。状语从句中表示“过多久…才…”为before 的用法。选D。
考点:考查状语从句中的连词
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