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【题目】It takes time to study and understand a sudden attack by an ________virus against humans.(know)

【答案】unknown

【解析】

句意:研究和理解一种未知病毒对人类的突然攻击需要花费时间。
分析句子横线处缺少形容词,根据句意以及know可知需要用其形容词形式作定语,unkonwn意为未知的,未被确认的符合题意,故填unknown

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