问题补充:
The factory produces half a million pairs of shoes every day, 85% sold abroad.
A. of them are
B. of them is
C. of which is
D. of which are
答案:
A. of them are
B. of them is
C. of which is
(答案→)D. of which are
解析:句意:这个工厂每天生产50万双鞋,85%的鞋被销往国外。这个句子包含一个非限制性定语从句,且“85%的鞋”和“销往”之间是被动关系,故用被动语态,选D。