He was about to leave the office for home someone knocked the door and asked for some hel

发布时间：2020-08-17 11:00:42

He was about to leave the office for home     someone knocked the door and asked for some help.
A. until
B. while
C. as
D. when

网友回答

A. until
B. while
C. as
(答案→)D. when
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。
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