since when ,since then的区别（在线等）
since when ,since then的区别（在线等）
he came back from abroad in 1998,since when,he has been doing his business.这一句中为什么用since when 却不能用since then ,
he came back from abroad in 1998,since when,he has been doing his business.这一句中为什么用since when 却不能用since then ,
英语人气：348 ℃时间：2020-01-30 17:34:35
优质解答
这是个以when引导的定语从句,不能用then的,因为since when前面是逗号
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