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
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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。

not...until怎么倒装? until 句首 倒装 需要倒装吗 不是not until! not until倒装句中的用法 until...和not until... not ...until not.until. not until的句型,是前面倒装还是后面倒装? 倒装：the little girl didi not feel happy until she saw her presentnot until 倒装 It is not until that.(强调句)中not until算在句首吗,主句倒装吗? not until……的表达是什么意思?后面怎么倒装? it is not until这个句型要倒装吗 not until放在强调句中不倒装?请举个例子好吗 not until与not...until的差别 请英语达人将以下句子倒装Pears isn't talented until she is 15 years old.用not until倒装用Not until 主句谓语要提前吗？ 英语翻译加（not.until) not until用法 not until的用法 not until的用法!