1.What did he do yesterday ?i wondered.(合并为一句,句意不变)
题目
1.What did he do yesterday ?i wondered.(合并为一句,句意不变)
2.I think he will be back,--- ---?(改为反意疑问句)
3.China is ___ ___ ___(第二大国)country in the world.
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答案
i wondered that what he did yesterday
isn`t he?
the second biggest
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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