on school days
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school day前要加a吗
大多数不需要： winter break:I'm going skiing during winter break.我放寒假期间去滑雪. weekend:What are you doing next weekend?你下周末打算干什么? school day 前面也不需要：I can't play computer games on school days.我上学时不能打电子游戏. It's a school day tomorrow,I can't stay up too late...