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The work has lived here for twenty years_____ A,since twenty

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The work has lived here for twenty years_____ A,since twenty years ago B.since he came here
C.twenty years ago D.twenty years before
为啥啊
The work has lived here for twenty years_____ A,since twenty
B
A,since twenty years ago (错误的表达方法~没有since 和ago连用的)
B.since he came here (对滴)
C.twenty years ago (ago 和过去时连用不和完成时连用)
D.twenty years before (这个是和间接转语也就是转述别人的话是把twenty years ago 改成twenty years before )
since是完成时的标志~和完成时连用~
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