被二一、 被當：flunk out（不需被動式）
If you don’t study hard for your next exam, you’re going to flunk out of the program.
如果你下次段考再不認真唸書的話，你那科就會補當。
補退學 ：be forced to drop out
輟學：drop out
Chris was forced to drop out of school due to consistent bad grades.
Chris因為成績太爛而被退學了.
consistent (adj.) 連續的
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