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This isn't___( I )book.___ ( my ) is in the bag .

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This isn't___( I )book.___ ( my ) is in the bag .
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答案和解析
第一空用形容词性物主代词my,修饰名词book,第二空用名词性物主代词Mine,它相当于一个名词,在本句中做主语,相当于my book.望采纳,祝好运!