题目内容
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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