单选题 The committee rejected his thesis because it was based mainly on conjecture rather than solid evidence and lacked______tested results.

【正确答案】 C

【答案解析】解析：既然空格前说这篇论文不是基于实在的论据所做成的，也那就是说，它缺乏由实在的论据所验证了的结论，四个选项中与“solid evidence(实在的论据)”意思相近的是选项C．empirically。