the students are working hard(对划线部分提问)hard划线

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thestudentsareworkinghard(对划线部分提问)hard划线thestudentsareworkinghard(对划线部分提问)hard划线thestudentsareworkin

the students are working hard(对划线部分提问)hard划线
the students are working hard(对划线部分提问)hard划线

the students are working hard(对划线部分提问)hard划线
How are the students working?