单选题 After _____ seemed an endless wait, it was her turn to step into the doctor’ s office.无
【正确答案】 C
【答案解析】句意: 经过无休止的等待后, 终于轮到她进医生的办公室了。 what在从句中充当谓语动词“seemed”的主语, 与after组成一个时间状语。