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once there was a king who had three sons .是什么句式?所关系到什么语法?详解一下.谢谢!

题目详情
once there was a king who had three sons .是什么句式?所关系到什么语法?详解一下.
谢谢!
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答案和解析
Once 表示曾经,然后是一个There be句型(there was a king),who had three sons 是定语从句修饰king.