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】容易誤選B，認為這是非限制性定語從句。
　　【分析】最佳答案是A。與上面一題相似，their parents seated together joking 不是非限制性定語從句，而是一個獨立主格結(jié)構(gòu)，因為空格后的動詞 seated 不是謂語，而是一個過去分詞，因為 seat 作動詞用時，是及物動詞。比較以下相似題：
　　(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
　　選B。whose parents were seated together joking 為非限制性定語從句，因為其后有完整的謂語 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
　　選A。因為句中有并列連詞and，整個句子為并列句。
　　(3) On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.
　　A. their　　　　　　　　　　　　　B. whose
　　C. which　　　　　　　　　　　　D. that
　　選A。their parents sitting together joking 為獨立主格結(jié)構(gòu)。
　　(4) On Sundays there were a lot of children playing in the park, _______ parents sat together joking.
　　A. their　　　　　　　　　　　　　 B. whose
　　C. which　　　　　　　　　　　　D. that
　　選B。whose parents sat together joking 為非限制性定語從句，因為句中有完整的謂語 sat。
　　(5) On Sundays there were a lot of children playing in the park, _______ parents were sitting together joking.
　　A. their　　　　　　　　　　　　　B. whose
　　C. which　　　　　　　　　　　　D. that
　　選B。whose parents were sitting together joking 為非限制性定語從句，因為句中有完整的謂語 were sitting。

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