英语改过去的肯定、否定、疑问
题目
英语改过去的肯定、否定、疑问
they are
he runs in the play
we have lunch
括号提问答案
They were workers.They were not workers.Were they workers?What were they?He ran in the playground.He didn't run in the playground.Did he run in the playground?Where did he run?We had lunch at noon.We ...
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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