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Some of the people who ( ) to the party can't come now.A are

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Some of the people who ( ) to the party can't come now.A are invited B have been invented
用现在完成时被动语态的have been invented是为了表明动作先发于can't come 的.因为先“邀请”,再“来”
再问: 如果有 were invited可以选不?
再答: 如果有 were invited而没有have been invented的话,可以选;若两者都有,后者更为精确,只是出题的人一般水平较高,不会让两者都出现的。