After seemed an endless wait, it was her turn to enter the general manager’s office. A. t

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A. that
B. how
(答案→)C. what
D. why
解析：
这里考查what引导的宾语从句，介词after后面接的是宾语从句，而宾语从句中缺少主语，用what引导宾语从句，并做从句的主语，句意是：在无尽的等待后，轮到她进入总经理的办公室了。