not until倒装Not until he failed the exam__that working hard i
not until倒装 Not until he failed the exam__that working hard is important. A> had he known B>did he know C>he knew D>he had known 选哪个,为什么 working hard is ...现在时
Not until he failed the exam__that working hard is important.A> had he known B>did he know C>he knew D>he had known选哪个,为什么 working hard is ...现在时答案解析:Not until 主语+谓语 +倒装结构(助动...