单项选择题
According to Philip Powell( Book 2, Unit 2), there is sufficient evidence to support that the time spent on social networks had an adverse effect on children at the moment. ( )
According to Philip Powell( Book 2, Unit 2), there is sufficient evidence to support that the time spent on social networks had an adverse effect on children at the moment. ( )
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单项选择题
A．a
B．b
C．c
D．d