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What is the meaning of the sentence?

1 個月前
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.

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Mikiko
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3:11 PM (GMT+02:00)
用戶加入時間:: 2016年9月10日