havebeendoing什么意思

　　have been doing是现在完成进行时。

　　例句：

　　I have been doing some historical research.

　　我一直在进行史学研究。

　　We have been doing it for years.

　　我们多年来一直在做这个。

　　We have been doing it for years.

　　我们多年来一直在做这个。