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
(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.
句意不明白，不理解句子的意思。
所以解释也看不懂。
求大家帮忙！
我的理解哦,这句话的意思大概是这样的: 任何一个医学实验有时都回漏掉这样一种情况, 那就是: 当他出现时, 那些医学实验回说他没有出现.
其实就相当于比如一个人确实得了癌症, 但是某些医院的检查结果是阴性的(没有得),或者那个人根本没有的癌症, 可是有的医院的检查结果却是阳性(得了)
BDE很明显是错的. 在A 中, 用了一个泛指的One, 又用了一个特指的it, 在一个句子中, 用了泛指就不能用特指, 所以排除A, 选C
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