The scientists have made an______study of the viruses that cause the disease.A.exhaustedB.
The scientists have made an______study of the viruses that cause the disease.
A.exhausted
B.exhausting
C.exhaustive
D.exhaustion
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。