Playing electronic games for hours ______ does great harm to one’s eyesight.

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问题 Playing electronic games for hours ______ does great harm to one’s eyesight.

选项 A、on purpose
B、on end
C、on business
D、on schedule

答案B

解析 该句意为:连续玩几个小时电子游戏对视力有害。on purpose:故意;on end:连续(in a row);on business:因公;on schedule:准时。
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