lesson后用什么介词.the boy works hard ( ) his lessons.all the teachers like him .A in B of C at D from

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lesson后用什么介词.the boy works hard ( ) his lessons.all the teachers like him .A in B of C at D from
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lesson后用什么介词.the boy works hard ( ) his lessons.all the teachers like him .A in B of C at D from
lesson后用什么介词.the boy works hard ( ) his lessons.all the teachers like him .
A in B of C at D from

lesson后用什么介词.the boy works hard ( ) his lessons.all the teachers like him .A in B of C at D from
选C
work hard at,固定词组搭配,努力工作(学习)
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