单选题Playing electronic games for hours _____ does great harm to one’s eyesight.Aon purposeBon endCon businessDon schedule
单选题
Playing electronic games for hours _____ does great harm to one’s eyesight.
A
on purpose
B
on end
C
on business
D
on schedule
参考解析
解析：
句意：连续玩几个小时的电子游戏对视力有害。on purpose故意。on end连续地。on business为了公事；出差。on schedule按时。
句意：连续玩几个小时的电子游戏对视力有害。on purpose故意。on end连续地。on business为了公事；出差。on schedule按时。
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