After an______study the doctors found out the root cause of this obscure disease.

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问题 After an______study the doctors found out the root cause of this obscure disease.

选项 A、exhausted
B、exhausting
C、exhaustive
D、exhaustible

答案C

解析 exhaustive指“(论述、研究等)全面而彻底的,详尽无疑的”,如:an exhaustive search/report/analysis/investigation详尽的搜寻/报告/分析/调查。
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