he bought a new car .改疑问句did he bought a new car?还是 did he buy a new car?
题目
he bought a new car .改疑问句did he bought a new car?还是 did he buy a new car?
新概念第一册学完了.在第二册开头有个test.标准答案里是did he bought a new car?.问题是上面哪个对,Did后面难道不是动词原形吗?
答案
did he buy a new car才是正确的
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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