Profile Picture

What is the meaning of the sentence?

4 years ago
It's 11.00 a.m. and I ______ half an hour of work this morning!
a. did b. 've been doing c. 've done
I can't simply understand what the speaker is trying to say.

half an hour of work - I would never say like this.
Profile Picture
3:36 PM (GMT+02:00)