语法大全987第115题

448258130

Any medical test will sometimesfail to detect a condition when it is present and indicate that there is onewhen it is not.

(A) a conditionwhen it is present and indicate that there is one

(B) when a conditionis present and indicate that there is one

(C) a condition when it is present and indicate that it is present

(D) when acondition is present and indicate its presence（C）

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

其它选项错误明显，选C无异议，但是不懂为什么C选项中的第一个it可以清晰的指代a condition，不是应该是any medical test 吗？
求NN指点迷津

板栗在奋斗

呃= =这个it后面的谓语和宾语可以明显帮助判断指代，无歧义。

448258130

板栗在奋斗 发表于 2013-8-17 11:15
呃= =这个it后面的谓语和宾语可以明显帮助判断指代，无歧义。

谢谢回复，是根据句子意思么。any medical test is present语法没错，句子意思不通，所以是指代condition，是这样么？

板栗在奋斗

448258130 发表于 2013-8-17 11:29
谢谢回复，是根据句子意思么。any medical test is present语法没错，句子意思不通，所以是指代condition ...

嗯嗯（为了凑够10个字！）