Some people won't realize the importance of their health _____ they have lost itA、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
问题描述：
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
答
not...until 直到。。。才。。。
答
我也遇到过这种题目
老师就是这么告诉我们的
固定词组
答
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)