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标题: 求助：白勇语法第二章第50题 [打印本页]

作者: tanyawu 时间: 2010-7-29 08:09
标题: 求助：白勇语法第二章第50题
白勇语法第二章第50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.

A a condition when it is present and indicate that there is one
C a condition when it is present and indicate that it is present

请问A和C比较为什么要选C? 白勇的批注看不太明白。

作者: tanyawu 时间: 2010-7-29 21:04
对噢，说得有道理！

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