A. which B. them C. what D. that

　　答案选B，由于两句之间增加了一个并列连词but，使得该句成了一个并列句。

　　6. On Sundays there were a lot of children playing in the park, _________ parents seated together joking.

　　A. their B. whose C. which D. that

　　【陷阱】容易误选B，认为这是非限制性定语从句。

　　【分析】最佳答案是A。与上面一题相似，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。比较以下相似题：

　　(1) On Sundays there were a lot of children playing in the park, _________ parents were seated together joking.

　　A. their B. whose C. which D. that

　　选B。whose parents were seated together joking 为非限制性定语从句，因为其后有完整的谓语 were seated。

　　(2) On Sundays there were a lot of children playing in the park, and _________ parents were seated together joking.

　　A. their B. whose C. which D. that

　　选A。因为句中有并列连词and，整个句子为并列句。

　　(3) On Sundays there were a lot of children playing in the park, _________ parents sitting together joking.

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