Question

how long does it take you to get from home to school？句中to get 作什么用？此句完整的回答是什么？

如果没有to get ，变成how long does it take you from home to school？正确吗？

Answer 1

不对
get to 到达
how long does it take you to 【get】 from home 【to 】school？
这样改一下，或许你能看明白：
how long does it take you to 【get to】school from home ？

完整的回答：
It takes me two hours to get from home to school

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追问

我还以为是 how long does it take you to get 【from home to school】，我就想，这个get 放在这干吗的啊

追答

实际上就是：
how long does it take you to 【get to】school from home ？

Answer 2

此句完全没错。它是美国人口语化的说法。
您也可以换个说法:
How long does it take you to get to school from home? 从你家到学校得花多长时间？
回答可以是： About 20 minutes. 大约二十分钟。

Answer 3

正确