Only then did he realize he had lost an opportunity for achieving his great dreams
题目
Only then did he realize he had lost an opportunity for achieving his great dreams
在 这句话中did he realize 是什么成分
答案
Only then did he realize ...等同于He realized ... at that time
是固定用法
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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