2. 外语
  3. The scientists have made an______study of the viruses that cause the disease.

The scientists have made an______study of the viruses that cause the disease.

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问题 The scientists have made an______study of the viruses that cause the disease.
选项 A、exhausted
B、exhausting
C、exhaustive
D、exhaustion
答案C
解析 词汇，同源词。exhausted过去分词形容词化，耗尽的；exhausting现在分词形容词化，费时耗力的；exhaustive穷尽的，彻底的；exhaustion耗尽。科学家们对引起这种疾病的病毒进行了彻底的研究。
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