My mother is busy ____ (write)all day.
题目
My mother is busy ____ (write)all day.
用所给词的适当形式填空
答案
My mother is busy __writing__ (write)all day.
这里是一个固定搭配,be busy+doing sth.表示“忙着干什么”
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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．
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