She had just finished her homework when her mother asked her to practise plying the piano yesterday.
题目
She had just finished her homework when her mother asked her to practise plying the piano yesterday.求高手来分析一下这句话的when是从属连词还是并列连词?
答案
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．
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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