问题补充：
a student is found cheating in the exam, he will not escape from being punished.
A. While
B. Though
C. Until
D. Once
答案：
A. While
B. Though
C. Until
(答案→)D. Once
解析：句意：一旦一个学生被发现考试作弊，他不会逃脱被处罚的。A. While当…时候，虽然，尽管，B. Though虽然，C. Until直到， D. Once一旦，选D。
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