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

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。
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