单项选择题

What is the author trying to tell us（）

A．Happiness often goes hand in hand with pain.
B．One must know how to attain happiness.
C．It is important to make commitments.
D．It is pain that leads to happiness.

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吉姆过去常常认为花在学习上的时间越多成绩就会越好，但是现在他认识到事实往往并非如此。

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如果时间和精力允许的话，他们愿意做一些兼职工作以增加收入。