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
看看E, 对幛多么工整啊! 可就是不对呢? 相比之下，Ｃ就差远了．
detect the presence of a condition when it is there indicate its presence when it is not
因为e中的代词指代有问题啊。
结构平行要注意，不能拘泥于非常严谨的形式平行。能够形式对称最好，为了整个语法结构的正确，有时也要变通一下，只要大方向对称就好。个人意见。
c的结构其实也很平行的。
多谢了! 还有一个问题，e中的it 为什么不能指condition呢?
回了一大片，怎么没有了
(E) the presence of a condition when it is there and indicate its presence when it is not.
蓝对蓝，黄对黄。红和蓝的内容不同，所以错。
并列结构中，同个代词it要内容相同。个人意见。你再看看og解释，体会一下。
图文并茂, 多谢啦!
但还是忍不住想改成: (E) the presence of a condition when the condition is there and indicate the condition's presence when the condition is not (there).
奥... 突然意识到少了一个there, 但是不能省略there吗?
E根本就不平行indicate与fail平行，否则后半句意思正好相反。然后象我爱宝宝MM说的，E中it指代前后不同。
1.it 是！只能指代单一名词：
（C）严格的做到了这一点，全句3个it逻辑指代都是“condition”
2. 怎可以it 指代the presence of a condition：
（E）据“就近指代”原则，最后一个it，就近的noun.是“its presence”="the presence of a condition";
这种情况，导致it指代不唯一，所以错
是不是这也说明了，一个句子里，所有格its和it的指代，实际是允许不统一的。
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