it happened at about 6 o,clock yesterday evening,when I-----

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it happened at about 6 o,clock yesterday evening,when I-----from work
A come home B was coming home C got home D was getting home
此题考查when的用法,我的答案是A,答案上是B,请说明原因.

在过去某一时刻正在做某事用过去进行时.【昨晚六点是一个具体时刻,故用过去进行时.选B.】
when一般连接一般过去式和过去进行时.一般when引导的从句用一般过去时【如果是过去状态的话】,但这里有具体某一时刻,要另作理解.
while和when意思相同,但while引导的从句用过去进行时.while也可连接两个过去进行时态的句子,表示两个动作同时发生.

it happened at about 6 o,clock yesterday evening,when I----- It happened at about 6 o,clock yesterday evening,when I ---- It was 6 o’clock yesterday evening. 英语翻译I was watching TV at 8 o' clock yesterday evening.I was it was at 8 o' clock yesterday evening _____ the electricity 如 At 7 o"clock YESTERDAY evening i heard him _____ (唱歌） in t i come home at six o'clock yesterday evening.改为一般疑问句 The robbery was happening at five o'clock yesterday evening. Her mother was cooking dinner at 6 o'clock yesterday evening it's seven o'clock in the evening they must ____ at home i t when i finished _____ yesterday,it was 9 o'clock in the even It（）seven o'clock when I（）home yesterday. A,was,get B,is,get