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

问题补充：

After seemed an endless wait, it was her turn to enter the personnel managers office．

A. that

B. how

C. what

D. why

答案：

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。