推荐回答（6个）
首先理解一下这句话，意思是：
直到河水中鱼死完了，人们才能意识到污染有多严重。
这里是固定句型，not nutil在前面的话，后一句中do动词需要提前，所以应该选A。
应该选A。 请注意当NOT UNTIL出现在句首时主语是需要倒装的，因此C不能选。B把助动词省略了，而D选项使用的DIDN'T改变了句子的原意。
希望能帮到你~~~~~~~~
A…… not until引导的从句，后面主句谓语动词要倒装。直到鱼都死了，人们才意识到污染有多严重。
not until 开头 这个应该是倒装语序吧 应该是did the people realize 选a 这个是语法上的用法 记住就好了
not until提到句前就意味着后面的句子要倒装，所以排除B和C，这句原话其实是The people didn't realize how serious the pollution was until all the fish died in the river.将句中not until提到句首，所以就剩下did realize，倒装之后就是A了。
选A did the people realize，Not until构成倒装句。
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