My father has many books,some of___ are on history 空格填which还是them?Why?

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My father has many books,some of___ are on history 空格填which还是them?Why?
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My father has many books,some of___ are on history 空格填which还是them?Why?
My father has many books,some of___ are on history 空格填which还是them?Why?

My father has many books,some of___ are on history 空格填which还是them?Why?
them
它做of的宾语,代替books.