— What made you so upset? — the exam.A. Failing to passB. To fail passingC. Failing pass

问题补充：

— What made you so upset?

— the exam.

A. Failing to pass

B. To fail passing

C. Failing passing

D. To fail to pass

答案：

(答案→)A. Failing to pass

B. To fail passing

C. Failing passing

D. To fail to pass

解析：本题考查动词的-ing形式作主语，完整形式为Failing to pass the exam made me so upset.。fail to do表示“未能做到”。