2. 外语
  3. ______a good teacher, one must first be a good pupil .

______a good teacher, one must first be a good pupil .

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问题 ______a good teacher, one must first be a good pupil .
选项 A、Being
B、Having been
C、To be
D、To have been
答案C
解析
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专业英语四级

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