Some people won't realize the importance of their health ___

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Some people won't realize the importance of their health _____ they have lost it
A、after B、when C、until D、unless
这道题选c,为什么不选D,请详细分析,谢谢
我觉得用unless翻译这句话也可以，为什么要用until

not ···until意思是直到······才······时间状语引导词,这一点和汉语表达习惯不同.
有些人直到失去健康才意识到它的重要.
二者用途是不一样的
unless 除非···,如果不 ,是条件状语引导词,if ```not
I shall go tomorrow unless it rains. 　我要去,除非明天下雨
　------Shall Tom go and play football? 　　------Not unless he has finished his homework. 　
I won’t attend his birthday party unless invited (= unless I am invited)

Some people won't realize the importance of their health ___ Many people won't realize the importance of their health （） People should be educated to realize the importance of... people don't realize the value of health until they lose it 1.Many students can't realize the importance of English Many students didn't realize the importance of study ______ Many students didn't realize the importance of study__they l Many students didn’t realize the importance of study _______ Now more and more people r___ the importance of health Some people haven't _____（意识到）the importance of protecting t Some people didn't realize the important of water until it b a lot of people tried their best,but ___ won the prize.A.man