My father left Beijing a week ago because of his new job,改为(在补充处)
题目
My father left Beijing a week ago because of his new job,改为(在补充处)
My father --- --- --- from Beijing for a week because of his new job
答案
has been away 用现在完成时
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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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