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1.Tanya is a famous singer.
Tina and Judy are famous singers.(用all 合并成一句)
2.Judy had a nice summer vacation.
Susan had a nice summer vacation.(用both 合并成一句)
答案
1.Tanya is a famous singer.Tina and Judy are famous singers.(用all 合并成一句) 2.Judy had a nice summer vacation.Susan had a nice summer vacation.(用both 合并成一句)答案：1.Tanya,Tina and Judy are all...
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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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