seat一定是be seated?what surprised me was to see some

问题补充：

seat一定是be seated?what surprised me was to see some of the village people

答案：

what surprised me was to see some of the village people (who was) seated on the beaches at the end of the room

省略了======以下答案可供参考======

供参考答案1:

seated 省略be

供参考答案2:

一个句子怎么可能有两个动词，后面的是过去分词形式，后置定语。