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

问题补充：

I don think its a good idea, ?

A. is it

B. isn’t it

C. do I

D. don I

答案：

(答案→)A. is it

B. isn’t it

C. do I

D. don 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。