Whose umbrellas are those?A.They're mine.B.they're your.C.Th

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Whose umbrellas are those?A.They're mine.B.they're your.C.They're her.
为什么?

A
mine是I第一人称单数的名词性物主代词,they're mine 相当于they're my umbrellas.
your和her 分别是第二人称和第三人称的形容词性物主代词,后面必须加一个成分才能表达需要的意思,如“your umbrellas”“her umbrellas”
复数they,them,their,theirs
主格：I,you,he,she,it,we,you,they
宾格：me,you,him,her,it,us,you,them
形容词性物主代词：my,your,his,hers,its,ours,theirs
名词性物主代词：mine,yours,his,hers,its,ours,theirs

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