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”;exhaustion是名词,意为“耗尽,疲惫,筋疲力尽,竭尽”。综合以上词义,可以判断正确答案为C。
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