There are 800 students in our school ,55％ [ ] are girls .【原因】
问题描述：
There are 800 students in our school ,55％ [ ] are girls .【原因】
A,of them B,in them C,of which D,of whom
答
A 在他们当中的55%.所以是55% of them. A
如果修饰800 students, C和D 要放在800 students后面