A选项不懂啊~拜托教下解释里的there is one不行,看不懂
Any medical test will sometimes fail to detect a condition when it is present one and indicate that there is one when it is not?
两个“one”指代的都是前面的condition
两个“it”指代的是test检验的结果
这句话的翻译大概是:一些(病毒),当这种东西存在的时候,检测不到;但是当它不存在的时候,却可以检测到。只medical test存在缺陷。
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