题目内容
（请给出正确答案）
[主观题]
According to Kellerman, why are there so many unhappy adults in the world？A．Becanse they a
According to Kellerman, why are there so many unhappy adults in the world？
A．Becanse they are not brighter than others.
B．Becaase they don't have good education.
C．Because they are not doing the things they are best at.
D．Because they are not duly encouraged in life.
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