At least the miracle happened for which his unconscious mind had been seeking for so long.
这个句子横线之前没有先行词，所以横线及横线之后的是个状语从句，when, where, why都不像，我个人认为是had been seeking for 中的for在题目中多打出来了的结果，即C选项中的for其实就是被多打印出来的for而以。
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