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    He was about to leave the office for home _______someone knocked the door and asked for some help.

    A．untilB．whileC．asD．when

    D

    解析试题分析:句意：他正要离开办公室回家这时有人敲门求助。固定句型：be about to do …..when 正要做某事……这时，选D。
    考点：考查连词用法。

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