巨噬细胞 外泌体:When he entered the classroom,he was some parenrs ___ at the back of it.

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为什么用seated 不用seating
打错了，应该是he saw some parents ___ at the back of it.

be seated 表示就坐的意思。
原题：
When he entered the classroom,he saw some parents seated at the back of it.

因为seat 当动词用是 使…就坐。 原句seat 没有宾语部分，所以用过去分词。如果是sit ,则用sitting.

怎么感觉这个句子有问题~你有没有打错什么词啊?
he was some parents.....??

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