大全115题，CD上没有确定的解释。

像风一样离去

115.    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

这题真难啊，我想了十分钟都还是选错了，看网上对这题的讨论也没什么结果，看那个大全注释也觉得英文理解起来模模糊糊的，有谁可以跟我说说么？感激不尽。

像风一样离去

我也是顿悟的。

小sai爱mj

我选的d，听这么分析明白了。。

像风一样离去

谢谢8楼的童鞋的回复，但我认为这个题目其实考的是对称。
detect+.......+when it is present
indicate+......+when it is not (present)
多工整的对称，当时怎么就没想到呢？
所以B和D是肯定不可以的了，因为他们满足不了这个对称，而E就更无厘头了。
答案就在A和C之间产生：

A项中用了one，我窃以为one指代和it指代的不同之处在于one指代的是同名异物，it则是同名同物。

换句话说，A项用one指代condition会让人认为前面的condition和后面的condition是两个不同的东西，而这里前后的两个condition依照文意必须是同一个condition，要用it指代，所以选C.

像风一样离去

我当时选的是B。

cdy1234567

主句结构是fail to (detect..(1).. and indicate..(2)..)平行关系，我认为就是说fail to detect和fail to indicate都可以单拿出来成句吧？
所以==>
A1) = a condition when it is present; (2) = that there is one when it is not==>(2)中it 指代什么？
B: (1) = when a condition is present; (2) = that there is one when it is not==>(2)中it 指代什么？
C: (1) = a condition when it is present; (2) = that it is present when it is not  ==>我选(C)，it指代it指代it指代condition？
D: (1) = when a condition is present; (2) = its presence when it is not==>(2)中it 指代什么？
E: (1) =  the presence of a condition when it is there ; (2) = its presence when it is not ==>(1)wordiness

小sai爱mj

你选的什么呢？

像风一样离去

再顶一次，麻烦NN帮我看看吧。

像风一样离去

是这题难么？怎么没有人回答呢？

像风一样离去

这句话的意思是：对于任何一种医学测试，都有可能在有些时候不能正确检测出健康状况（有健康问题时显示没有，无健康问题时显示有）。英文可补全为
Any medical test will sometimes fail to detect a condition when it is present and indicate that there is a condition when it is not present.

-- by 会员 cycyang (2011/3/13 22:18:29)

我是觉得C项那个it is present when it is not 好不通顺。正解是不是这个a condition 必须放到最前引导两个并列结构呢？求指教。