反义疑问句No one was interested in his lecture,_____?

问题描述:

反义疑问句No one was interested in his lecture,_____?
答案是were they
为什么用这个?
帮忙找一点依据或者一些特殊的反义疑问句的用法
能不能用 was he?或者 was it

有一个规则:
当句子中的主语是不定代词 everybody,nobody,somebody,everyone,no one ,someone时,反义疑问句中的代词有下面的惯用:
人用they代,物用it代 .