◎ 题干
The factory produces half a million pairs of shoes every year, 80% _______ are sold abroad.
A.of which 
B.which of 
C.of them 
D.of that
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The factory produces half a million pairs of shoes every year, 80% _______ are sold abroad.A.of which B.which of C.of them D.of that…”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。