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-----
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