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After having taken off,the plane flew low over the city.帮我分析

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After having taken off,the plane flew low over the city.帮我分析一下前面那句的时态好么?是什么时态?为什么要这样用?
After having taken off,the plane flew low over the city.帮我分析
真正的主语是plane,the plane 先是 take off (飞机降落),然后再是flew low over the city.
飞机降落已完成动作,所以用完成时,因为after是介词,后接名词,所以have 变成名词形式:having.