OnSundays there were a lot of children playing in the park, parents seated together joking

On Sundays there were a lot of children playing in the park, parents seated together joking.
A. whose
B. their
C. which
D. where

A. whose(答案→)B. theirC. which D. where解析：考查独立主格。句义：在星期天，有许多孩子在公园里玩，家长们坐在一起开着玩笑。把握逗号后的非谓语动词seated，这是关键词，由此确定是非谓语，而不是从句，所以A Ｃ　D都不对，所以B正确。

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