After seemed an endless wait, it was her turn to enter the personnel manager's officeA.

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A. that
B. how
(答案→)C. what
D. why
解析：句意：经过似乎无尽的等待，该到她进入人事部经理的办公室了。因为after后面缺少一个宾语，而seemed前面缺少一个主语，所以我们要选一个既能充当after的主语又能充当seemed的关系代词，what就是答案，因为what相当于something+which。选C。