David knocked at the door for nearly half an hour______Mary opened it, unwilling.
A．whenB．whileC．untilD．before
D

試題分析：考查狀語從句中的連詞。句意：David敲門敲了將近半個小時Mary才不情愿地打開。狀語從句中表示“過多久…才…”為before 的用法。選D。
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