21.It was not until he arrived in class _____ realized he had forgotten his book.
题目
21.It was not until he arrived in class _____ realized he had forgotten his book.
答案
这个有问题,
我觉得是
It was not until he arrived in class did he realized that he had
forgotten his book.
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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