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英语
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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 ,
人气:254 ℃ 时间:2020-01-30 17:34:35
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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