请教各位一道高中英语题~-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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请教各位一道高中英语题~-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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请教各位一道高中英语题~-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
请教各位一道高中英语题~
-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

请教各位一道高中英语题~-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
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
D
since.Fred 一小时前离开了公司.从那以后,他的工作就留着一直没完成.
用现在完成时,work是被留下的 所以是被动态.