have been doing是现在完成进行时，表示从过去一直持续到现在，并且现在并未停止，还将持续到将来。have done 现在完成时，到现在为止已经完成。
扩展资料
I have been doing it for two days.
这件工作我已做了两天了。
I have been doing this course for a year.
我学了这个课程已经有一年了。
I have been doing some historical research.
我一直在进行史学研究。
标签：been,doing,时态
版权声明：文章由 知识问问 整理收集，来源于互联网或者用户投稿，如有侵权，请联系我们，我们会立即处理。如转载请保留本文链接：https://www.zhshwenwen.com/article/197342.html
