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Can you explain ____?A、why were you late B、why you were late

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Can you explain ____?A、why were you late B、why you were late C、what's happened to you D、B and C
Can you explain ____?A、why were you late B、why you were late
D、B and C
宾语从句用陈述句语序,B对
what has happened to you 比较特殊,可以理解为已经是陈述句语序了,what视作主语
类似的有 Can you explain what's wrong with you/ what's the matter with you
再问: 为什么是what has而不是what is?
再答: 's=has/is 都有啊,看具体结构需要啥 She's been there before=She has been there before She's sleeping=She is sleeping happen是无被动的,所以作现在完成时的has