The factory produces half a million pairs of shoes every day 85% sold abroad.A. of them

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。