问题补充：
---What made him so upset?
-----
A. Failing in the test
B. He failed in the test
C. Because he failed in the test
D. To fail in the test.
答案：
(答案→)A. Failing in the test
B. He failed in the test
C. Because he failed in the test
D. To fail in the test.
解析：情景交际。根据上文，什么让他如此沮丧？结合语境可知考查主语，现在分词短语表示抽象动作，可知选A，在考试中不及格。选项BC不能用作句子主语。
