Having done结构
Having collected and evaluated the information, I help
other scientists to predict where lava熔岩from the volcano willflow next and how fast.
收集和评估这些信息之后，我就帮助其他科学家一起预测熔岩接着将往何处流，流速是多少。
[考点] Having collected and evaluated是动词-ing形式的完成式，说明它表示的动作在主要谓语表示的动作之前发生。
1.Many Chinese brands, __ havingdeveloped _____ (develop)their reputations over centuries, are facing newchallenges from the modern market.
此处使用完成式的ing分词形式是表示动作先于主句完成，例如，Having realized my mistake ,Idecided to apologize to my teacher.
2.__ Having spent ______(spend)the
past year as an exchange student in Hong Kong，Lindaappears more mature than those of her age.
【解析】 Having spent 句意：作为交换生在香港待了一年，琳达显得比其他同龄的人更成熟。spend与句子主语Linda存在逻辑上的主动关系，且spend这个动作又发生在句子谓语动词appear之前，故用现在分词的完成式。
3.[考例] The storm left, _____ a lot of damage to this area.
A.caused B. to have caused C. to cause D. having caused
4. [考例] _____ in the queue for half an hour, Tom suddenly realized that he hadleft his wallet at home.
A. To wait B.
Have waited C. Having waited D.To have waited
5. 核实所有的门都锁好之后，史密斯先生就去伦敦度假了。
_______Having checked ___ all the doors
were locked，Mr. Smithleft for London on holiday.
6. Having done结构的被动式考查
Having been shown(show) the lab，we were taken to see the library.
Having been explained many times, he stillcouldn’t understand.
