The Berlin Wall has been many years____in history as a famous building in the world
题目
The Berlin Wall has been many years____in history as a famous building in the world
A,long B,old C,of D,tall要说就解释一下罗,到底是哪个?A,B,C,
答案
a.have been some years long .长达.年之久.
i haven't been there long.我在哪儿没呆多长时间.
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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