Jane is away on holiday.Oh,is she?Where has she gone?为什么不是Where has she been going?
题目
Jane is away on holiday.Oh,is she?Where has she gone?为什么不是Where has she been going?
答案
has she been going?是现在完成进行时,表过去某时间正在进行的动作.通常用表持续性的动词.可能现在仍在继续（有一直的意味）如果用Where has she been going,怎么译呢?只能表达他一直在去某个地方,且一直没有到达某...
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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．
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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