分类：教育/科学-外语学习
问题：英语题Thefactoryproduceshalfamillio 
The factory duces half a million pairs of shoes every year ,80 persant (  ) are sold abroad.A.of which  B.which of  C.of them  D.of that
回答：A.of which 
考察定语从句  非限制性
先行词 shoes ， 意思是百分之八十的销 往国外

C.of them   如果后面是一个句号 就对了。 

 D.of that   that 不能放在介词后 
B.which of   错误说法