has been working on his degree是什么意思

has been working on his degree是什么意思 How long has Greg been working on his degree--- five years? he has been working on his book for the past two mouths when he has been working on the paper. 英语翻译His Company has been working with Brazilian local partne After he has a rest,he goes on working.是什么意思? My father has been working on this farm for the whole five y John has been working on the essay whole afternoon and he st has been worked和has been working的区别 She has been working for 20 hours he has been working there ( ) 1998. He has been working here.为什么要用working?