"You’d better work harder if you don’t want...

Câu hỏi: "You’d better work harder if you don’t want to retake the exam!” the teacher said to Jimmy.

A. The teacher advised Jimmy to work harder if he didn't want to retake the exam. 

B. The teacher ordered Jimmy to work harder if he didn't want to retake the exam. 

C. The teacher reminded Jimmy to work harder if he didn't want to retake the exam. 

D. The teacher warned Jimmy to work harder if he didn't want to retake the exam.