Question

Where have you been? I ________ you all the afternoon．

1. A.
   waited for
2. B.
   have waited for
3. C.
   have been waiting for
4. D.
   had waited for

Answer 1

C
用现在完成进行时表示“等”的动作从过去一直持续到现在，all the afternoon是一个提供信息的时间状语。