On the whole,the time ________ the students devote to the games in the Internet cafes without doubt has a great effect on the study in the school．A.in whichB.on whichC.whenD.that
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D解析考查定语从句。主语为time，而谓语为has a great effect on，空格中所缺的词引导定语从句修饰the time，先行词在句中作devote的宾语，所以使用关系代词。