单项选择题

One must have studied hard before one could make great progress in one's study.（）

A．在学习中取得大的进步之前只有刻苦学习。
B．不下苦工夫是不能在学习上取得大的进步的。
C．谁肯下苦工夫，谁就能在学习上取得大的进步。
D．必须勤学苦练，才能在学习上取得大的进步。

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