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The buses, most of _________ were already full, were surrounded by an angry crowd.
A. that B. it C. them D. which
【陷阱】容易误选 C，用 them 代指 the buses。
【分析】最佳答案是D。most of which were already full 为非限制性定语从句，修饰 the buses。类似地，以下各题也选D：
(1) His house, for _________ he paid $10, 000, is now worth $50, 000. A. that B. it C. them D. which
(2) Ashdown forest, through _________ we’ll be driving, isn’t a forest any longer.
A. that B. it C. them D. which
(3) This I did at nine o’clock, after _________ I sat reading the paper. A. that B. it C. them D. which
类似地，以下各题选 whom，不选 them：更多真题及资料请加小编微信65210638领取
(4) George, with _________ I played tennis on Sundays, was a warm-hearted person.
A. that B. him C. them D. whom
(5) Her sons, both of _________ work abroad, will come back home this summer.
A. that B. who C. them D. whom
(6) I met the fruit-pickers, several of _________ were still university students.
A. that B. who C. them D. whom
