----Why did you get so angry with Tom then?
----I had been waiting for seemed for ages before he finally turned up.
A. that
B. which
C. what
D. when
网友回答
A. that
B. which
(答案→)C. what
D. when
解析：考查宾语从句。本题中的宾语从句what seemed for ages是介词for的宾语。What引导起这个宾语从句，并在句中作主语。句意：—为什么你那个时候如此生Tom的气？—在他出现之前，我已经等了似乎好几年的时间。A项不能在句中做成分，when在句中只能做状语。B项是指特定范围之内的某一个。故C正确。