The course normally attracts 20 students per year, up to half will be from overseas.
A. in which
B. for whom
C. with which
D. of whom
网友回答
A. in which
B. for whom
C. with which
(答案→)D. of whom
解析：考查介词+关系代词引导定语从句。先行词是20 students，是人，不能用which引导，排除A,C；代入定语从句 up to half will be from overseas应是up to half of the 20 students will be from overseas.所以选D。