A. them B. which C. what D. that
(3) He told me that he had two girl-friends, neither of _______ knew anything about the other.
A. whom B. them C. which D. who
(4) He told me that he had two girl-friends, and neither of _______ knew anything about the other.
A. them B. whom C. which D. who
7、 He had a lot of friends, only a few of ______ invited to his wedding.
A. whom B. them C. which D. who
【易错】容易误选 A，认为这是非限制性定语从句。
【分析】最佳答案是B，这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 invited 并不是一个完整的谓语，而是一个过去分词。当然，假若在 invited 前加上助动词 were，则是一个非限制性定语从句，答案便应选A。比较：
(1) They put forward a lot of plans at the meeting, none of _______ carried out in their work.
A. which B. them C. what D. that
答案选B，none of them carried out in their work 是独立主格结构，其中的 carried out 为过去分词。
(2) They put forward a lot of plans at the meeting, none of _______ were carried out in their work.
A. which B. them C. what D. that
答案选A，none of them were carried out in their work 是非限制性定语从句，注意与上例比较句中多了一个助动词were。
(3) They put forward a lot of plans at the meeting, but none of _______ were carried out in their work.
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。
8、 On Sundays there were a lot of children playing in the park, _______ parents seated together joking.
A. their B. whose C. which D. that
【易错】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。