There have been no leeters from my parents since I left home two years ago.
题目
There have been no leeters from my parents since I left home two years ago.
There have been 什么意思```如果是there BE句型和现在完成时```那是不是还少个be
答案
there be 句型也有现在完成时
就是There have been
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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