高中英语语法题（急）you look tired.yes,I____non-stop until seven o clo

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高中英语语法题（急）
you look tired.
yes,I____non-stop until seven o clock this morning
A have worked B was working
C an working D will work
B 但我不知道为什么

选B,显然,到今天早晨是过去的动作,until引导时间状语,意思是我一直在工作知道今天早晨七点,所以用过去进行时,不能用现在完成时.
楼上解释是错误的,如果用现在完成进行时,则表示过去的动作一直持续到现在,还有可能持续到将来,而题意是持续到了过去,已经停止.

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