He was about to leave the office for home _______someone knocked the door and asked for some help.
A．untilB．whileC．a(chǎn)sD．when
D

試題分析:句意：他正要離開(kāi)辦公室回家這時(shí)有人敲門(mén)求助。固定句型：be about to do …..when 正要做某事……這時(shí)，選D。
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