英语翻译takingtherecentaccidentwhichhappenedinyunnanasanexample,hadthedepartmentsconcernedpaidmoreattentiontopeoplescomplaints,therewouldhavebeensomuchinjuryanddeath.请问上述中间插入一个had...done本身是什

　　英语翻译

　　takingtherecentaccidentwhichhappenedinyunnanasanexample,hadthedepartmentsconcernedpaidmoreattentiontopeoplescomplaints,therewouldhavebeensomuchinjuryanddeath.

　　请问上述中间插入一个had...done本身是什么句式,什么结构?另外后面那个wouldhave是将来完成时吗?haddone这个句式,求例句.