She would have been more agreeable if she had changed a little bit ______? [2003]A.hadn"t

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She would have been more agreeable if she had changed a little bit, ______? [2003]

A.hadn"t she

B.hasn"t she

C.wouldn"t she

D.didn"t she

请帮忙给出正确答案和分析,谢谢!

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