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It's the third time that John has been late,__?

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It's the third time that John has been late,__?
A.hasn't he
B.isn't he
C.isn't it
D.hasn't
C .为啥不是hasn't?】
是不是就是说 反义疑问句中 逗号后头那个是和主句的主语一致和从句中的主语没关系?
It's the third time that John has been late,__?
这里的it's是 it is的缩写,根据前肯后否的原则,后面就是isn't it.
that从句只是做time的定语从句,反意疑问句跟这个无关,所以不用考虑从句.
问题补充:是不是就是说 反义疑问句中 逗号后头那个是和主句的主语一致和从句中的主语没关系? 谢谢!
不一定,但主句是由I don't think引导的宾语从句的时候,反意疑问句的的主谓必须跟从句的保持一致,而且必须是用肯定的.例如,I don't think he will join us, will he?