12. Lily didn't come to school, did she?

12. Lily didn't come to school, did she?
____. She was ill in bed.
A.No ,she did B. Yes , she did.
C. No ,she didn't. D. Yes ,she didn't
13.--She isn't a teacher, is she?
--_____. She works in a hospital.
A.No ,she isN'T. B. Yes , she is.
解释下答案