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问题：
[不定项选择题] 资料：Native ads - or ads that take on the look and feel of the content surrounding them - are taking over digital advertising.By 2021, native display ad revenue in the US, which includes native in-feed
A、An overall native forecast.
B、Ad frequency and scalability issues.
C、The forecasts for how revenues from these formats will grow over the next five years.
D、The illustrations of what factors are driving up spending on each of these ad units.
参考答案：
A、An overall native forecast.
● 参考解析
