After（） seemed an endless wait, it was his turn to enter the doc

After（） seemed an endless wait, it was his turn to enter the doctor’s office.

A、

not

B、

it

C、

what

D、

there

【正确答案】：C
【题目解析】：

这个句子是after（此处为介词：表示在时间，事件之后）引导宾语从句，括号处缺少主语成分，选项中BCD均可做主语，it seems...为固定句型，it在句中是形式主语，而且其完整形式通常为it seems to be 或it seems that....放在空白处是不合适的， there seems 是there be 句型的变形，其形式应该为there seems to be...,因此D选项也需要排除，只有C选项合适。

句意：经过了无休止的等待后，终于轮到他进医生的办公室了。