问题补充：
I will never understand how it that you failed in the examination for you are such a good student.
A. came about
B. brought in
C. stayed up
D. ended up
答案：
(答案→)A. came about
B. brought in
C. stayed up
D. ended up
解析：考查词组：A. came about发生B. brought in引进，赚钱C. stayed up熬夜D. ended up结束，句型：How did it come about that…，怎么会…,句意：我永远不能理解我是怎么考试不及格的，因为我是好学生。选A。
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