work hard () English A.in B.at C.on

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work hard () English A.in B.at C.on
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work hard () English A.in B.at C.on
work hard () English A.in B.at C.on

work hard () English A.in B.at C.on
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work hard at English
努力英语
固定搭配
work hard at…在……方面努力工作
work hard at sth努力学习
work hard at math在数学上努力
work hard at sth.在…努力
work hard (at)勤奋工作