【单选题】

—What made him so happy

—______ as the model student in school.
A、He being elected
B、His electing
C、His being elected
D、His been elected

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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

14%的考友选择了B选项

75%的考友选择了C选项

2%的考友选择了D选项