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关于seat的用法Thenewcomersintheclassroombegantotalkeventheydidn'tknoweachother.为什么填seated而不是seatthemselves?

题目详情
关于seat的用法
The newcomers____in the classroom began to talk even they didn't know each other.
为什么填seated 而不是seat themselves?
▼优质解答
答案和解析
句子的谓语是began,seated属于主语部分,因而只能是过去分词短语做定语.如果用seat themselves就得用and来连接.