现在完成进行时(have/has been doing) 表示某一动作开始于过去某一时间,延续或重复地出现至今,或将继续延续至将来。 例:We have been working on this project for over a month now. 到目前为止,我们一直在处理那个项目,已经花了一个多月时间了。 05 一般过去时 (did...
Professor Wang has been doing the research on English literature for more than 30 years. He has written more than 10 books, some of which have been published in England and the USA in recent years. Now he is teaching English literature in a famous ...
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