Mr.brown has lived here since twenty years是对是错

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• Mr.brown has lived here since twenty years是对是错
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• Mr.brown has lived here since twenty years是对是错
• I have studied here （ ）many years ago. A. since B. for C, before D. after选什么?我选的A,不知是对还是错,这题所在单元讲的是现在完成时
• Twenty years ______ passed since I came here.填的是 have 还是 has.为什么?
• The worker has lived here fortwenty years______ A,since twenty years ago B,since he came hereC,twenty years ago D.twenty years before
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