The course that Beijing University offers normally attracts 30 foreign students per year; _______ up to half will be from America.A.in whichB.for whomC.with whichD.of whom
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D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。