what were you doing yesterday?等于what what did you do yesterday?
题目
what were you doing yesterday?等于what what did you do yesterday?
答案
不等于!
what were you doing yesterday?
意思是：你昨天正在干什么?
强调过去正在进行的动作.
what did you do yesterday?
意思是：你昨天干了说明?
只是强调过去的动作.
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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