反义疑问句He never did well in maths when he was at school,________?
题目
反义疑问句He never did well in maths when he was at school,________?
答案
did he
因为never表示否定,而反义疑问句前否后肯
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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