我在这里已经工作2年了（现在还在这里上班）,I have worked here for 2years 还是I have been working
题目
我在这里已经工作2年了（现在还在这里上班）,I have worked here for 2years 还是I have been working
here for two years?Or both are correct?Are there any differences between them?thank you very much!
那么，我已经洗了三个小时的衣服，也是 I have washed clothes for 3 hours 和 I have been washing clothes
答案
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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