同义句:Bob was so happy because his father bought him a computer yesterday.
题目
同义句:Bob was so happy because his father bought him a computer yesterday.
改为:Bob was so happy because his father -------- a computer ------ him yesterday.（横线上填什么)
答案
Bob was so happy because his father ----bought---- a computer ---for--- him yesterday.
buy sb sth = buy sth for sb
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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