单项选择题

During the conversation between Billy, Chenxing and Daoxin, we took a close look at _______.

A．the poverty issue in the future
B．the children’s education issue in the future
C．the pollution issue in the past
D．the social issue in the past

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单项选择题非游戏活动游戏化的常见做法是编制教学游戏

多项选择题下列可以查询到票房数据有的有（）。