i have done the training for two days这句通顺么?
题目
i have done the training for two days这句通顺么?
答案
如果想指训练才开始两天,就把done改成been doing,i have been doing the training for two days,表示已经训练两天了,如果想表示你已经结束了只有两天的训练,就把for改为of,i have done the training of two days....
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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．
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