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work hard at your lesson还是on your lesson

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work hard at your lesson还是on your lesson
work hard at your lesson还是
on your lesson 还是都可以?
work hard at your lesson还是on your lesson
2者皆可 at用在学业上 on则泛指一切努力的对象
You always work hard at your lessons and I wish you success in your College Examinations.你总是很用功,我祝你高考成功.
-- 高中英语口语25天快训 - Day 15 Congratulations