We often hear the girl sing on the playground
题目
We often hear the girl sing on the playground
要改为被动语态哦!
答案
The girl was often heard singing at the playground.
p.s.playground不是操场,而是有滑梯跟秋千的那种小孩子的游戏场地.
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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