In our class there are 60 students a quarter wear glasses. A. in whomB. in themC. of the

问题补充：

In our class there are 60 students, a quarter wear glasses.

A. in whom

B. in them

C. of them

D. of whom

答案：

A. in whom

B. in them

C. of them

(答案→)D. of whom

解析：考察定语从句。本题定语从句的先行词是60 students。在定语从句指whom指代先行词作为介词of的宾语。这里的of表示的是所属关系。句意：在我们班级里有60个学生，其中有四分之一都戴眼镜了。BC两项不是定语从句。A项中的介词搭配错误。故D正确。