问题
选择题
The course normally attracts 20 students per year, ____ up to half will be from overseas.
A．in which
B．of whom
C．of which
D．for whom
答案
答案：B
题目分析：句意：这个课程正常一年吸引20个学生，其中有一半是来自海外。这里使用了定语从句，先行词是20 students，定语从句中是half of the 20 students will be from overseas.所以用of whom引导定语从句，选B。