简单四选一?谢谢！

是反意疑问句,前面是否定用肯定,是肯定用否定.但比如:I don't
thinkhe is smart,is he?而第三人称就不一样了，如：She thinks he isn't smart,doesn't?这是看人称的变化与哪个是主句．

这里的反义疑问句是对“it is the third time he has been late”的提问，前边是肯定，所以问句要用否定。

C是"it is the third time he has been late"的反义疑问句.

应该是反义疑问句吧。

因为它问的是forfor it is the third time he has been late后面的，与John isn't a diligent student无关

答案是C 这句话的意思是约翰不是一个勤快的学生,这已经是他第三次迟到了.针对他已经是第三次迟到的这个肯定的句子,就应该接否定,约翰是第三人称单数,所以用is not it,故选C