请看下面的题，是用them, which还是whom?
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(from www.nmet168.cn)：
(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(from www.nmet168.cn)：
(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
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