1 . — The boy has never listened to what teachers say in class or done his homework, but in this exam he got such a good mark again.
— ___________
— What he learnt from Bad Genius (《天才枪手》) is wrong.
Which sentence can be best used in the blank?

A．He cheated in the exam.

B．He has cheated in the exam.

C．He is always cheating in the exam.

D．He cheats in the exam.