_______ a teacher in a university, it is necessary to have at least a Master's degree. ( 章节：1 难度：3)
- A、To become
- B、Become
- C、One becomes
- D、On becoming
正确答案:A
答案解析:有
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_______ a teacher in a university, it is necessary to have at least a Master's degree. ( 章节：1 难度：3)
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