“IF NAM HADN’T GONE TO SCHOOL YESTERDAY, HE WOULDN’T HAVE UNDERSTOOD THAT LESSON

89. “If Nam hadn’t gone to school yesterday, he wouldn’t have understood that lesson.”

From this sentence we know that ………

A. Nam didn’t go to school yesterday and he didn’t understand that lesson

B. Nam went to school yesterday but he didn’t understand that lesson.

C. Nam didn’t go to school yesterday but he understood that lesson.

D. Nam went to school yesterday and understood that lesson.