neverland1021 发表于 2015-1-25 12:33
不是大神,尝试来解答:
这句话的层次是这样:1)any medical test will sometimes fail to...when... and ...
ukyo2003 发表于 2015-1-25 18:13
强迫症的我一定要找到原题划线才能看进去。。。
Any medical test will sometimes fail to detect a condi ...
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