2. 外语
  3. The anti-virus agent was not known ______ (直到一名医生偶然发现了它).

The anti-virus agent was not known ______ (直到一名医生偶然发现了它).

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问题 The anti-virus agent was not known ______ (直到一名医生偶然发现了它).
选项
答案until a doctor discovered/found it by chance/accidentally
解析 本题考点在于以下两点：(1)表示“直到……”用until；(2)中文中的“偶然”用by chance或者accidentally表达。
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大学英语四级

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