The old professor,_____ in Beijing for 30 years,is on the wa

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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

这道题正确答案选 B.
这里考察非谓语动词作时间状语,老教授在北京工作了30年后,正在回家乡的路上.
非谓语动词的完成时表示发生在谓语动词之前的动作.
现在完成时和一般过去时都可以和表示一段的时间状语连用,就是所表达的含义不同,
eg ,He lived in Beijing for three years .他过去在北京住过三年.
He has lived in Beijing for three years.他在北京住了三年了（说明现在还住在北京）

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