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

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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（助动词提前）+主语+ 谓语结构（主句倒装,从句不倒装）
Not until he failed the exam did he know that working hard is important.
直到考试失败之后他才知道努力学习是很重要的

B.有以下例句：He didn't go to sleep until his mother came back.倒装即可，老师说过的

B
后面是“真理”，用一般现在时。

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