has been doing是什么时态怎么翻译

　　The government has been doing some blue-sky thinking on how to improve school standards.

　　就如何提高学校的水平，政府仍然在作一些漫无边际的构想。

　　He has been doing this sort of work for years.

　　他干这一行有年头了。

　　It is said the industrial production has been doing well.

　　据说工业生产一直很好。

　　China has been doing its bit to act the part.

　　中国一直在尽力的做它应该做的事情。

　　He has been doing mass work and engaged in scientific research.

　　他一直从事群众工作和科学科研工作。