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

【答案】unknown

【解析】

句意:研究和理解一種未知病毒對人類的突然攻擊需要花費時間。
分析句子橫線處缺少形容詞,根據(jù)句意以及know可知需要用其形容詞形式作定語,unkonwn意為未知的,未被確認(rèn)的符合題意,故填unknown。

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