I don't think it's a good idea, ?A. is itB. isn’t itC. do ID. don't I

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(答案→)A. is it
B. isn’t it
C. do I
D. don't I
解析：这是反意问句, 陈述句部分的主句中的主语是第一人称,谓语动词是think, believe suppose等时, 反意问句要与宾语从句的主、谓语保持对应关系。本题是否定转移。