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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