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

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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