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  3. The top PhD programs set an incredibly high bar: a lot of coursework, teaching experience, qualifying exams, a thesis defense, a

The top PhD programs set an incredibly high bar: a lot of coursework, teaching experience, qualifying exams, a thesis defense, a

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问题 The top PhD programs set an incredibly high bar: a lot of coursework, teaching experience, qualifying exams, a thesis defense, and of course making a______research contribution in your area.
选项 A、heart-broken
B、record-breaking
C、back-breaking
D、ground-breaking
答案D
解析 四个选项的意思分别是：heart-broken心碎的，伤心的；record-breaking破纪录的；back-breaking使人疲劳至极的；ground-breaking开创性的，独创的。空格所在句意为，项级的博士生项目设置了一个极高的标杆：大量的课程、教学经验、博士资格考试、论文答辩以及，当然，在你的研究领域做出的突破性研究贡献。据此可知，正确答案是D选项。
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