Ifihadbeeninvitedtoyourbirthdayparty,iwouldhaveboughtabirthdaygiftforyou.若我想把这句话写成独立主格结构那么if引导的从句该如何改写?我是这么写的:Havingbeeninvitedtoyourbirthdayparty,iwouldhaveboughtabirthdaygiftforyou.可别人说这么不对.希望有人能帮忙改下这句话.
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