My mother opening the window.(用现在完成时改) He got to the cinema.the firm had begun.(用before连
题目
My mother opening the window.(用现在完成时改) He got to the cinema.the firm had begun.(用before连
答案
My mother has opened the Window.
The film had begun before he got to the cinema.
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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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