21、Hours of playing violent video games can affect the way the brain works, ______ damage to certain cells of brain and slowing brain activity.

     A. to cause                   B. causing             C. cause                       D. caused

21、B

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科目：高中英語 來源： 題型：

Hours of playing violent video games can affect the way the brain works, ______ damage to certain cells of brain and slowing brain activity.

     A. to cause                   B. causing             C. cause                       D. caused

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科目：高中英語 來源： 題型：

Hours of playing violent video games can affect the way the brain works, ______ damage to certain cells of brain and slowing brain activity．

A．to cause          B．causing         C．cause           D．caused

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