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onsundaystherewerealotofchildrenplayinginthepark,parentsseatedtogetherjoking.答案是their..它说后面parentsseated.是独立主格.但我觉得这是个句子.有主语.parents.谓语seated.为什么么?而且有点怪,onsunday

题目详情
on sundays there were a lot of children playing in the park,___parents seated together joking.
答案是their..它说后面parents seated.是独立主格.但我觉得这是个句子.有主语.parents.谓语seated.为什么么?
而且有点怪,on sundays there were..居然用过去时?
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答案和解析
应该是可以理解.
句子可以使从一片文章中摘出来的叙述的是过去发生的事情,填写时遵循已有的时态.
seat是主动动词,用法是be seated,后面的完整从句应该是their parents were seated together joking.
作为独立主格从句,省略was.