选A啦,见下c.
陈述部分为主语从句或并列复合句?
a.并列复合句疑问部分,谓语动词根据邻近从句的谓语而定.
Mr.Smith had been to Beijing for several times,he should have been in China now,shouldn't he?
b.带有定语从句,宾语从句的主从复合句,疑问部分谓语根据主句的谓语而定：
He is not the man who gave us a talk,is he?
He said he wanted to visit Japan,didn't he?
c.上述部分主句谓语是think,believe,expect,suppose,imagine等引导的宾语从句,疑问部分与宾语从句相对应构成反意疑问句.
I don't think he is bright,is he?
We believe she can do it better,can't she?
但此时主语必须是第一人称
如果不是则不能否定从句
如 He thought they were wrong,didn't he?
而不能说weren't they?