的吗 At end of question

In my chinese exercises I found the following sentence: 你坐出租车来学校的吗？

It roughly translates as "Are you coming to school by Taxi?". However, I don't understand why the 的 is there. I know that it can be used to talk about possession or as a particle that makes a sentence more certain, but it doesn't look like any of these uses fit here.

submitted by /u/tohava
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/bvxja3/的吗_at_end_of_question/

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