he was about to chang his mind when an idea_to him
a occurred b had occured
c was occured d had been occured
人气：233 ℃ 时间：2020-10-01 14:40:52
解答
选 A
这里occure发生,和happen一样,是没有被动语态的,所以排除C和D
when引导的时间状语从句,时态必须一致,主句用过去时,从句也用过去时.
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