I don't think your sister has finished her course,__?A.do I

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I don't think your sister has finished her course,__?A.do I B.hasn't she ..
I don't think your sister has finished her course,__?
A.do I B.hasn't she 为什么不选A,请详解

这题答案应该是has she?不是hasn't
主句用第一人称+think表达自己的想法意见,此时不对主句进行反义疑问,即,I think没意义,可以拿掉,但是注意not要保留,所以此句是前否后肯.

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