after the mother came back,the boy went to bed.（保持句子意思）
题目
after the mother came back,the boy went to bed.（保持句子意思）
the boy____go to bed_____his mother came back
答案
didn't until
直到.才.
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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