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--why do you look so worried?----My computer broke down and my essay __A__umfinished since.A has been left B has left为什么不选B呢?

题目详情
--why do you look so worried?----My computer broke down and my essay __A__umfinished since.
A has been left B has left
为什么不选B呢?
▼优质解答
答案和解析
B是主动
A的被动