83. Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.
(A) a condition when it is present and indicate that there is one
(B) when a condition is present and indicate that there is one
(C) a condition when it is present and indicate that it is present
(D) when a condition is present and indicate its presence（C）
(E) the presence of a condition when it is there and indicate its presence
Only choice C, the best answer, produces a sentence in which every pronoun it refers clearly and logically to the noun condition. In choices A and B, the phrase indicate that there is one does not grammatically fit with when it is not because it has no referent. Choices B and D are imprecise in saying that a test will fail to detect when a condition is present, since the issue is the presence and not the timing of the condition. Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence. Choice E repeats this error; also, the presence... when it is there is imprecise and redundant.
这两句话看的不是很明白，我觉得d,e中无论是it还是its都是指condition，没有问题啊，为什么解释会这样说，it怎么会有指代presence的可能呢？
Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.
这道题目我也没怎么搞明白，不过语感上是C比较好；
至于上面那句og解析，我想是：如果D放入句子，那么it就只在最后出现了，那么它就要指代离它最近的单数名词了，就是presence，呵呵
但是 gemj对代词的总结中不是说ets中的代词没有就近指代这一规则的吗？
D，E 中indicate its presence when it is not. it可能会引起歧义指代presence.
楼上mm说的有道理。以d为例：
when a condition is present and indicate its presence when it is not则后面的it既可以指代condition，也可以指代presence。
这就是Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.的主要含义。
Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.
这道题目我也没怎么搞明白，不过语感上是C比较好；
至于上面那句og解析，我想是：如果D放入句子，那么it就只在最后出现了，那么它就要指代离它最近的单数名词了，就是presence，呵呵
B和D改变了detect 后的关键词啊。when 不对啊。
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