关于before until since 等的疑问

关于before until since 等的疑问

题目
关于before until since 等的疑问
Few people will pay attention to their health (  )they get disease.
答案说是until 我想问before能用吗?
We were chatting on the net ( ) the light went out.
.答案是when~我不知道能不能用until~还有这句翻一下~
Three years had passed( )i knew it答案是before 能不能用when...
答案
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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