since的用法 - Yahoo!奇摩知識+

英文課時 我原本寫的句子是我們已經好久不見了,自從最後一次我們見到彼此"It has been a long time since we saw each other last time".但卻被外籍老師改為"It has been a long time since we have seen each other.請問是甚麼意思????" 為什麼 ...

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