翻译：昨天晚上的这个时候你在做什么? what were you doing at this time yesterday evening 还是
题目
翻译：昨天晚上的这个时候你在做什么? what were you doing at this time yesterday evening 还是
what were you doing this time yesterday evening
答案
what were you doing at this time yesterday evening?加时间状语应该要介词
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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