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【单选题】

After two years he received the certificate of the college for ______ in chemistry.
A．proficiency

B．diversion
C．immersion
D．involvement
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根据网考网移动考试中心的统计，该试题：

75%的考友选择了A选项

23%的考友选择了B选项

1%的考友选择了C选项

1%的考友选择了D选项

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