once harm is done to the environment,it takes years to have the system _
题目
once harm is done to the environment,it takes years to have the system _
A recover
B recovering
C recovered
D to recover
答案
C
have sth done 固定搭配,have the system recovered ,让生态系统恢复
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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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