He was doing hie homework when his father came yesterday was doing是不是谓语 his是定语 homework是
题目
He was doing hie homework when his father came yesterday was doing是不是谓语 his是定语 homework是
宾语 when his father came yesterday 是时间状语吗但是yesterday可以放在句首喔 是修饰全句吗
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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．
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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