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He's almost finished ______the book,____ he?

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He's almost finished ______the book,____ he?
A.reading;isn't B.to read;isn't
C.reading;hasn't Dto read;hasn't
我知道答案是选 C,可是为什么这个地方是用has那什么地方用is?
前面主句用一般现在时态、人称为单三人称时,用is/isn't