He worked in a sawmill for 20 years,___ he ___ ___ (变聋) in the end.
题目
He worked in a sawmill for 20 years,___ he ___ ___ (变聋) in the end.
答案
感觉应该是 until was deaf
,until he turned/becomed/was deaf(变聋) in the end.
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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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