On Sundays there were a lot of children playing in the park, _______ parents seated together joking.
A. their B. whose
C. which D. that
On Sundays there were a lot of children playing in the park, _______ parents seated together joking.
A. their B. whose
C. which D. that
A
their parents seated together joking 不是非限制性定语从句，而是一个独立主格结构，因为空格后的动词 seated 不是谓语，而是一个过去分词，因为 seat 作动词用时，是及物动词。