The old professor,_____ in Beijing for 30 years,is on the way back to his hometown.A.to work B.having workedC.workingD.to have worked选什么为什么什么时候用一般过去时+for 一段时间?急
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![The old professor,_____ in Beijing for 30 years,is on the way back to his hometown.A.to work B.having workedC.workingD.to have worked选什么为什么什么时候用一般过去时+for 一段时间?急](/uploads/image/z/14018920-16-0.jpg?t=The+old+professor%2C_____+in+Beijing+for+30+years%2Cis+on+the+way+back+to+his+hometown.A.to+work+B.having+workedC.workingD.to+have+worked%E9%80%89%E4%BB%80%E4%B9%88%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8%E4%B8%80%E8%88%AC%E8%BF%87%E5%8E%BB%E6%97%B6%2Bfor+%E4%B8%80%E6%AE%B5%E6%97%B6%E9%97%B4%3F%E6%80%A5)
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