请教各位一道高中英语题~
-Whydoyoulookworried?-Fredleftthecompanyhalfanhourago.Hiswork_unfinishedsince.A.leftB...
-Why do you look worried?
-Fred left the company half an hour ago.His work _unfinished since.
A.left B.was left C.has left D.has been left
最好还要有很详细的解释啦~我基础不是很好
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