Subject + 被 + 选 + 为 + Noun
The verb 选 (xuǎn) means "to choose," "to select," or "to elect" in Chinese. It is used when making a deliberate decision among options, whether picking an item, choosing a person for a role, or voting in an election.
菜单上这么多菜,你选哪个?
Càidān shàng zhème duō cài, nǐ xuǎn nǎge?
There are so many dishes on the menu. Which one will you choose?
她花了很长时间才选好大学专业。
Tā huā le hěn cháng shíjiān cái xuǎn hǎo dàxué zhuānyè.
It took her a very long time to choose her college major.
你可以从这三个颜色里选一个。
Nǐ kěyǐ cóng zhè sān gè yánsè lǐ xuǎn yī gè.
You can pick one from these three colors.