the trees were cut down by the workers.the trees
题目
the trees were cut down by the workers.the trees
would be used for the building.两句话合并成一句话
答案
The trees which were cut down by the workers would be used for the building.
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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