2. 专升本
  3. ________ formal occasions, you should talk about some world issues or social problems, not abc yourself or your family.

________ formal occasions, you should talk about some world issues or social problems, not abc yourself or your family.

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问题 ________ formal occasions, you should talk about some world issues or social problems, not abc yourself or your family.
选项 A、In
B、At
C、On
D、By
答案C
解析 本题考查介词短语固定搭配。on formal occasions“在正式场合”。句意：在正式场合，你应该谈论一些世界问题或社会问题，而不是自己或你的家庭。
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