转化为现在完成进行时态 1、I taught here last year 2、he baganto make model planes when he was six
题目
转化为现在完成进行时态 1、I taught here last year 2、he baganto make model planes when he was six
答案
I has been teaching here since last year
he has been making model planes since he was six(begin 是瞬间动词 不能用现在完成进行时)
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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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