On Sundays there were a lot of children playing in the park,____parents seated together joking.为什么填 they?独立主格结构 请仔细分析下,
问题描述：
On Sundays there were a lot of children playing in the park,____parents seated together joking.
为什么填 they?独立主格结构 请仔细分析下,
答
填their吧
答
On Sundays there were a lot of children playing in the park, where parents seated together joking
答
填their.
独立主格省略BE动词,表达简便,具体定义不必再复制粘贴了.