烧结粒子:一道英语题(134)

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As soon as the students __sat__ (seat), the lecture began.

我不能肯定我的回答,帮我分析一下吧!谢谢了!

were seated
这里seat 是动词,意思是 使… 就坐

学生们一坐下,演讲就开始了。

were seated
或者用seated themselves也可以,但是这里不行