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5.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 it present and indicate that there is one
(b)when a condition is present and indicate that there is one
(c)a conditin when itis present and indicate that it is present
(d)wehn a conditin is present and indicate its presence
(e)the presence of a condition when it is there and indicate its presence 我觉得这个答案是平行对称的很好啊！有什么问题呢？E选项的问题是指代不合理，从when从句看it应该指代the presence of a condition，根据指代一致，its也应该指代the presence of a condition，就变成了出现的出现 |
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发表于 2015-12-1 00:34:45
