Question

where+are+they+going+to+see的回答是什么？

Answer 1

Where are they going to see?
意思是：
他们将要去哪里看？
回答：
They are going to see it in the park.
他们去公园看。
They are going to see it in cinema.
他们将要去电影院去看。

Answer 2

这是一个对方位状语发问的特殊疑问句，可以回答：They are going to see at the square.