问题描述：
They will also have control over () advertisements they watch.这里面填什么
意思就是他们将能够自由选择自己想看的广告,四个选择,what who that which.到底填什么,
意思就是他们将能够自由选择自己想看的广告,四个选择,what who that which.到底填什么,
问题解答：
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