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Mr.Simth has bought a lot of book for his daughter,_______ h

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Mr.Simth has bought a lot of book for his daughter,_______ he?
A.hasn't B.didn't C.doesn't
正确答案选A.
这道题考察反义疑问句, 反义问句的简短问句时态应该和前面句子的时态保持一致, has bought 是现在完成时,其否定的简短问句就应该用 hasn't .
Mr.Simth has bought a lot of books for his daughter,hasn't he?