（）I'm working hard____my lessonsA in B.with C.to D at

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（）I'm working hard____my lessonsA in B.with C.to D at
（）I'm working hard____my lessons
A in B.with C.to D at

（）I'm working hard____my lessonsA in B.with C.to D at
C
work hard in
致力于

A..

（ ）I'm working hard____my lessonsA in B.with C.to D at