·6.Not until all fish died in the river ___ how seriousness

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·6.Not until all fish died in the river ___ how seriousness the pollution was.
a.did he realize
b.he realized
c.he did realize
didn't he realize
选什么,怎么分析的?

a
not until．
直到...才(在...以前不)在句首时后用倒装语序；在句中不用倒装．
例句与用法:
1.It was not until he came that I left.
直到他来我才离开.
2.Not until eleven o'clock did he come home.
他到十一点才回家.
3.I don't know whether we will start the job or not until I see how the land lies.
在没有分析情况之前,我不知道是否要开始这项工作.
4.Not until last night did I get the news.
直到昨晚我才听到这消息.
5.Not until his friend offered to help could he do it.
他的朋友帮助他,他才有办法做那事.
6.Not until a few months later did he know the story.
直到几个月后,他才知道这故事.
7.It was not until a few months later that he knew the story.
直到几个月后,他才知道这故事.
8.It was not until he got seriously ill that he knew the importance of health.
直到他生了重病,他才知道健康的重要.

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