Question

【题目】This factory produces about one million pairs of shoes each year, 60% ________ are sold abroad.
A.of them
B.of that
C.of whom
D.of which

Answer 1

【答案】D
【解析】句意：每年这家工厂生产大约100万双鞋子，其中百分之60销往海外。本题定语从句的先行词是one million pairs of shoes，关系代词which指代先行词。A项不是定语从句，whom的先行词必须是人，that不能放在介词的后面。所以答案是D。