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综合知识·未细分 · 历年真题改编 · 题号 17301
单选题
综合知识
未细分
难度 3
真题改编 · 2021
央国企
题目
Volunteers in national science museum go through three months of study, training and discussion with experts before () to talk in public.
选项
4 个
A
being certified
B
Certifying
C
having been certified
D
certified
🔒
答案与解析
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