Question

---Mr Wu isn't a teacher, is he?

---______. He's taught in our school for 5 years.

1. A.
   No, he is
2. B.
   No, he isn't
3. C.
   Yes, he is
4. D.
   Yes, he isn't

Answer 1

C
反意疑问句的回答只与事实有关，根据后面提供的事实，他确实是一位老师。