after having taken off,the plane flew low over the city

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after having taken off,the plane flew low over the city
after having taken off,the plane flew low over the city.
1整个句子是个什么句子或句型?
2句中的after having taken off,take为什么用过去分词?我个人乱说哦：）别介意哦就是用过去分词taken话那having就应该用have了构成一个现在完成时的句子.
3如果having算动名词的话那taken应该是用原形take吧?
备注：要说一下句子是正确的,新概念的,当然,上面问题2和问题3我认为的认为肯定是不对的.
我们进入焦点，一楼朋友说是此句一个现在完成时态，三楼朋友说是过去完成时，我们在讨论一下。

1.整个句子就是一个 after引导时间状语从句后面跟着一个句子
2.3.
after可以做连词也可以作介词,作介词时后面就要跟短语而不能跟句子,这里很显然after是做了介词,因为后面跟的是having是个动名词形式.然后,后面的taken off,这里是说已经起飞,所以使用了现在完成时态,have done形式.
整个句子是说飞机起飞后,低飞掠过城市.
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哪里不明白可以再问我

After having taken off,the plane flew low over the city.帮我分析 after having taken off,the plane flew low over the city 英语翻译After taking off,we were flying low over the city and sl the plane has just [ ] a flew b taken off c flied d lang in the plane flew over the river in a f__________ we were flying low over the city A plane flew ____ the forest.A.over B.across The plane had taken off when i reached the airport The plane has taken off 这里的谓语是taken off吗 She sat down quiet taken off the (2/3)e told the plane ( ) ,A,had taken off B,put off C,was t By the time he got to the airport,the plane had taken off.改为