应该是Which one are you going to choose？
其中one和going to choose都已经给了
Which one are you going to choose?
宾语是the red one,所以对one进行提问。疑问词用which。
which one are you going to choose?
应该是这样的吧。。。
Which color are you going to choose?
提问问的是选择哪种颜色
Which one are you going to choose?
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