og 83 还是不明白

xxiaoyan

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

Only choice C, the best answer, produces a sentence in which every pronoun it refers clearly and logically to the noun condition. In choices A and B, the phrase indicate that there is one does not grammatically fit with when it is not because it has no referent. Choices B and D are imprecise in saying that a test will fail to detect when a condition is present, since the issue is the presence and not the timing of the condition. Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence. Choice E repeats this error; also, the presence... when it is there is imprecise and redundant.

这两句话看的不是很明白，我觉得d,e中无论是it还是its都是指condition，没有问题啊，为什么解释会这样说，it怎么会有指代presence的可能呢？

likui

Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.

这道题目我也没怎么搞明白，不过语感上是C比较好；

至于上面那句og解析，我想是：如果D放入句子，那么it就只在最后出现了，那么它就要指代离它最近的单数名词了，就是presence，呵呵

xxiaoyan

但是 gemj对代词的总结中不是说ets中的代词没有就近指代这一规则的吗？

sweetstar

D，E 中indicate its presence when it is not. it可能会引起歧义指代presence.

howardwang

楼上mm说的有道理。以d为例：

when a condition is present and indicate its presence when it is not则后面的it既可以指代condition，也可以指代presence。

这就是Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.的主要含义。

swlfx

以下是引用likui在2005-7-14 21:32:00的发言：

Further, its presence in D leaves the it in when it is not without a logical referent: it must refer to condition, not presence.

这道题目我也没怎么搞明白，不过语感上是C比较好；

至于上面那句og解析，我想是：如果D放入句子，那么it就只在最后出现了，那么它就要指代离它最近的单数名词了，就是presence，呵呵

好象只能这么理解啊

zsz_219

indicate 与fail to detect 并列。就好理解了。

ciscogeek

B和D改变了detect 后的关键词啊。when 不对啊。