A survey revealed that on average, college students spend almost as much time on______mobile phones as they spend doing physical

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问题 A survey revealed that on average, college students spend almost as much time on______mobile phones as they spend doing physical activity.

选项 A、they
B、their
C、them
D、theirs

答案B

解析语法：代词1．选项均为代词。2．名词mobile phones前应使用代词所有格，代词所有格可与形容词一样，修饰名词。

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