I am sure he did not know that his brother graduat...

Câu hỏi: I am sure he did not know that his brother graduated with flying colors.

A. He cannot have known that his brother graduated with very high marks.

B. He may not know that his brother is flying gradually up in a colorful balloon.

C. He should not have been envious of his brother's achievement.

D. That his brother graduated with flying colors must have been appreciated by him.