When he entered the classroom,he was some parenrs ___ at the

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

e 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.

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