题目内容
（请给出正确答案）
[主观题]
According to this conversation, what was the "stupid mistake"？A．The student forgot to hand
According to this conversation, what was the "stupid mistake"？
A．The student forgot to hand in his term paper because he was overtired and stressed.
B．The student handed in the earlier draft paper instead of the final edited paper.
C．The student missed the time to apply to grad school.
D．The student found the mistake of the mark on his paper.
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