用现在完成时改写下列句子
题目
用现在完成时改写下列句子
1.He went to Shanghai two days ago.He will be back soon.
2.My brother went to Beijing for the first time in 1997.He went there for the second time in 2006
答案
1.He has gone (been) to Shanghai for two days.He will be back soon.2.My brother has gone (been) to Beijing for the first time in / since1997.He has gone (been) there for the second time in / since 200...
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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