_______ a teacher, one must first be a pupil.

_______ a teacher, one must first be a pupil.
A、Being
B、Having been
C、To be
D、To have been
【正确答案】：C
【题目解析】：这句话强调的是目的to就表示目的，意思是要想成为一名老师，首先必须是一个学生。A选项表示已经是一位老师。

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_______ a teacher, one must first be a pupil.

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