【题目】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
在线课程【答案】B
【解析】句意：这个课程一般每年吸引20名学生，他们中一半来自海外。题干中先行词是20 students，定语从句的语序是up to half of the students will be from overseas，将the students改成whom，然后将of whom提到从句句首，故选B。