Any medical test will sometimes fail to detect a condition when it is present an

游客2024-01-13  16

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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