After seemed to be an endless wait, it was finally his turn to h

After seemed to be an endless wait, it was finally his turn to have the interview.
A、that
B、when
C、what
D、which
【正确答案】：C
【题目解析】：本题考察宾语从句，what seemed an endless wait为介词after的宾语从句，what相当于something that, 故选C。