在职研究生英语（二）
阅读短文，选出填入空格最合适的一项： Some parents worry th…
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阅读短文，选出填入空格最合适的一项：
Some parents worry that video games are bad for children. Yet a recent study found that, in moderate amounts, certain games may actually improve children's ability to solve problems. Children who played puzzle games for about an hour a day did better on reasoning tests than those who did not play at all. The researchers stressed, however, that ___ playing, more than three hours a day, was linked to poorer sleep and lower grades.
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