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Hisparentsdidn'tcatchhiswordsatonce.(改为被动语态)Hiswordsbyhisparentsatonce.

题目详情
His parents didn't catch his words at once.(改为被动语态)
His words___ by his parents at once.
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答案和解析
答案:weren't caught.原句didn't catch是一般过去时,一般过去时的被动语态的构成是was/were+动词过去分词,catch的过去式是caught,原句是否定式,故在was/were后加上not,根据words为复数,故答案是weren't caught