专四
A.continue
B.linger
C.delay
D.persist
【点睛】词汇辨析题。根据句意,此处指病毒死亡之前会存活一段时间,强调其顽固性和持续性。而A项“继续”,C项“延缓”,均不能准确表达句意。选项D“坚持”指不畏困难继续做某事,故不选。
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