The song____(sing) many times by the students in the past several months
题目
The song____(sing) many times by the students in the past several months
答案
应该填 has been sung
用现在完成时的被动语态.
在过去的几年间这首歌被学生们唱了很多遍.
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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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