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完形填空题求解答when -----(ask)what changed his mind.横线部位是填空位置.asked

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完形填空题求解答
when -----(ask)what changed his mind.横线部位是填空位置.asked .我的问题是.为什么不是填 be asked 这不是谓语动词吗.被动语态的结构不是be+过去分词吗?
完形填空题求解答when -----(ask)what changed his mind.横线部位是填空位置.asked
当从句的主语,与主句的主语相同时,可以省略从句的主语和be动词,例如:when (he was )told that his friend had won,he was very happy,此处when引导的时间状语从句中的主语被省略了,那be也应被省略.