He used to cause a lot of trouble.文中的空怎么填
题目
He used to cause a lot of trouble.文中的空怎么填
答案
(1)after his father's death a few years ago
(2)and didn't give up trying to help him
(3)Even the teachet agreed that Martin was wasting his time
(4)That's when I decided to change
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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