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Studying hard,you'll make rapid progress.
采用非谓语作条件状语,因为主语一样.谢谢可是要四个句子 能帮忙么？老师的作业 我实在整不出来有讲解最好可加分！study hard and you'll make rapid progress.Only ifyou study hard ,you'll ……Only if studying hard,you'll ……