请教紫皮sc上的一道题

cocoamocha

85.Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it it 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

E.the presence of a condition when it is there and indicate its presence

想了半天，还是有点迷茫在c,d选项之间。 （C为正确答案）

希望走过的路过的，帮我解答一下，万分感谢！

pinklover

把D填入，后半句为 indicate its presence when it is not, 不一致

[此贴子已经被作者于2008-12-25 4:34:20编辑过]

cocoamocha

能说说为什么c一致吗？我觉得也不太一致啊。。

a condition when it is present

it is present when it is not

Princika

c的it始终指代condition 不会造成误解

.Any medical test will sometimes fail to detect a condition when the condition(it) is present and indicate that the condition(it) is present

cocoamocha

我怎么觉得d也没造成什么误解！？

大家都来看看，帮忙解释的详细一点，谢了！！！

老想不明白，急死我了！

cocoamocha

亲爱的兄弟姐妹们，都过来看看吧，有能力解答，请不要吝惜敲打键盘啊！

AlienX

多敲鍵盤...鍵盤會壞...j/k

Someone/something detects something.
B跟D都馬上可以cross out...."Any medical test will sometimes fail to detect when..."
句子表達有問題, 根本不知道fail to detect what?

cocoamocha

明白了，太谢谢了。怎么一直没往那边想呢。。dect sth.