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 exhausted表示(be)worn out“疲惫的”；exhausting“令人疲乏不堪的”；exhaustive“无遗漏的、详尽的”，如exhaustive discussion(详细的讨论)；exhaustion是名词，意为“耗尽，疲惫，筋疲力尽，竭尽”，如nervous exhaustion(神经衰弱)。综合以上词义，可以判断正确答案为C。
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