The course that Beijing University offers normally attracts 30 foreign students per year;

The course that Beijing University offers normally attracts 30 foreign students per year; up to half will be from America.
A. in which
B. for whom
C. with which
D. of whom

A. in whichB. for whomC. with which (答案→)D. of whom解析：考查从句。Whom指代先行词30 foreign students作为of的宾语。句意：北京大学提供的课程正常每年吸引30个外国学生，其中的高达一半来自美国。

这个解释是对的