◎ 题干
According to the report, this virus was never known, which had claimed countless lives, _____ it was
accidentally found by a doctor.

[     ]

A. unless
B. since
C. so that
D. until
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“According to the report, this virus was never known, which had claimed countless lives, _____it was accidentally found by a doctor. [ ]A. unless B. since C. …”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。