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Tom says he will give me a new book._________.A.I'm sure of

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Tom says he will give me a new book._________.A.I'm sure of it .B.I'm sure he does.选哪个?...
Tom says he will give me a new book._________.A.I'm sure of it .B.I'm sure he does.选哪个?为什么?一定要理由哦.
Tom says he will give me a new book._________.A.I'm sure of
正确答案是A.
I'm sure of it 意思是“我确信他会”.其中的 it 指代“he will give me a new book”这件事,有时经常用I'm sure of that,其实是一个意思.
而B选项中的does用错了,应该是will来表示将来时,而不是一般时的does,这从主句就可以看出来.