请教一下，OG11，紫色，85题！

VINCENT1980

85．  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

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

牛牛可否帮俺翻译一下，这个题目俺都不明白丫在说虾米，呜呜呜～～～

lingerer

任何的医疗测试都有时候会误症：当症状存在时，无法检测到；或者是本来没有症状，检测结果却有。

VINCENT1980

谢谢楼上的，如果选E的话，为什么不对呢？？？

GiGi

因為the present 就已經表示它的存在.何必在後面後面說明when it is there?  

happylifelin

E :"it "has no clear reference , because the first "it "may refer to "presence", however , "it" should refer to "condition"