3道英语句子求高手帮忙修改下.
题目
3道英语句子求高手帮忙修改下.
I usually go to college by bus.
We have just finished painting the room.
They still were waiting when we arrived.
答案
1.I usually go to college by bus.（此句很好,没有错）2.We have just finished painting the room.（此句也很好,没有错）3.They still were waiting when we arrived.（此句可略作修改：They had been still waiti...
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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