i often hear this song_____(sing),but i have never hear her____(sing) it. 下面还有
题目
i often hear this song_____(sing),but i have never hear her____(sing) it. 下面还有
Listen!you can hear her____ it now.这三个空怎么填,讲一下为什么
答案
sung被动,sing主动,且表示频率,singing主动,且表示正在发生
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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