lesson前面加啥介词 he did not work hard ( ) his lessons 括号里填啥

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lesson前面加啥介词 he did not work hard ( ) his lessons 括号里填啥
lesson前面加啥介词 he did not work hard ( ) his lessons 括号里填啥

lesson前面加啥介词 he did not work hard ( ) his lessons 括号里填啥
he did not work hard ( at) his lessons work at lessons 钻研课程