請看下面的題，是用them, which還是whom?
The buses, most of _______ were already full, were surrounded by an angry crowd.
A. that B. it
C. them D. which
【陷阱】容易誤選 C，用 them 代指 the buses。
【分析】最佳答案是D。most of which were already full 為非限制性定語從句，修飾 the buses。類似地，以下各題也選D(from www.nmet168.com)：
(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
類似地，以下各題選 whom，不選 them(from www.nmet168.com)：
(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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