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...

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...