After seemed an endless wait, it was his turn to enter the director’s office.A. that B. i

网友回答

A. that
B. it
(答案→)C. what
D. which
解析：考察宾语从句。本题介词after后面的宾语从句中缺少主语，故使用连接词what引导这个宾语从句，并在句中作主语。That在宾语从句中不充当任何成分，it不能引导宾语从句。Which指特定范围之内的某一个。故C正确。