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【单选题】

The President of Harvard pioneered the elective system by ______ students were able to choose their own courses of study.
A．what

B．whom
C．that
D．which
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根据网考网移动考试中心的统计，该试题：

21%的考友选择了A选项

0%的考友选择了B选项

3%的考友选择了C选项

76%的考友选择了D选项

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