She has been dancing for two years.对划线部分提问 ___ ____ has shen been dancing __________
题目
She has been dancing for two years.对划线部分提问 ___ ____ has shen been dancing __________
2,She has been working for 20 hours.改为一般疑问句
2_____she _____ ____for 20 hours?
答案
1,how long has she been dancing
2,has she been working for 20 hours?
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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.
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