We must have the pipe fixed immediately.It ____(leak)for a whole week.
题目
We must have the pipe fixed immediately.It ____(leak)for a whole week.
答案
has been leaking
现在完成进行时 ,从过去某时间持续到现在,且仍将继续
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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