2. 外语
  3. Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.

Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.

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问题 Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.
选项 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
答案C
解析 该句的大概意思是：任何一种医学测试都不能保证100％的正确，有时候当的确某种病情存在时，它却检查不出来；而当不存在此病情时．它却会误测为存在有此病情。此句是考核对省略的灵活运用。A选项：从语法角度分析，it和one均指代a condition，但当把there isone和其后的未划线部分when it is not结合起来考虑，问题就显现出来了。很显然，when it isnot是一个省略结构，根据省略的原则，被省略部分可代回原处补全句子。而在这里，被省略的只能是there is one中的one，把one代入when从句中，即when it is not one。刚才已提到过one和it均指代a condition，使得when从句的含义让人费解，因而A、B错。D、E中：indicate itspresence表明了when it is not之后可补出presence，句意就会变为：此病情是一种存在，同样搭配不当。而只有C中的present,代回when it is not中，句子的含义才正确。同时，B、D中detect差宾语，不符合detect作为及物动词的用法。
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