（The University of Melbourne study主）（ shows谓）（ that people who use the Internet for their own reasons at work are about 9 percent more productive than those who do not.宾语从句）
宾语从句that people主 who use the Internet for their own reasons at work定语从句 are about 9 percent more productive表语 （than those who do not比较状语）.
who do not定语从句
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