( )a teacher, one must first be a pupil.A、BeingB、Having beenC、To beD、To have

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问题 ( )a teacher, one must first be a pupil.

选项 A、Being
B、Having been
C、To be
D、To have been

答案 C

解析本题考查非谓语动词的用法。其中，不定式在句中作目的状语。

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