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

分类: 作业答案 • 2021-12-28 11:05:56

问题描述：

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

答

them
它做of的宾语,代替books.答案是which……