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

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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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【B1】[br]【B17】A、identifyB、locateC、revealD、discoverA动词辨义。identify“识别，认出”，符合句