He couldn’t retake the exam because he missed too...

Câu hỏi: He couldn’t retake the exam because he missed too many lessons.

A. He would retake the exam if he didn’t miss too many lessons.

B. He could have retaken the exam if he hadn’t missed too many lessons.

C. If he missed to many lessons, he would retake the exam. 

D. If he had missed too many lessons, he wouldn’t have retaken the exam.