The news that they failed their exams discouraged their parents,__?反意疑问句的主语是什么,为什么?

问题描述:

The news that they failed their exams discouraged their parents,__?
反意疑问句的主语是什么,为什么?

it 附加疑问句只能用代词

这是一个从句,that引导的句子是the news的同位语,那么主句就应该是
The news discouraged their parents,所以,它的反义疑问句的主语就应该是the news,用反义疑问句也是对它用,所以答案就应该是didn't it?