My sister works in a library.（改为否定句）

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Mysisterworksinalibrary.（改为否定句）Mysisterworksinalibrary.（改为否定句）Mysisterworksinalibrary.（改为否定句）Mysiste

My sister works in a library.（改为否定句）
My sister works in a library.（改为否定句）

My sister works in a library.（改为否定句）
My sister doesn't work in a library.

My sister doesn't work in a library.