英语选择题高二____to a computer screen for a long time is bad for y

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英语选择题高二
____to a computer screen for a long time is bad for your eyes ,so you should have a rest every now and then.
这里为什么要填Being exposed,为什么我不可以理解为是省略句,省略了You are ,然后填空处填Exposing

应该是这样理you 发出expose 这个动作,your eyes是不能发出expose这个动作的.
前句中expose的逻辑主语是your eyes,所以用被动形式
再问：不太理解，这里不可以理解为省略吗，不是有个固定词组是be exposed to 吗
再答：对啊这个句子换种表达方式：If your eyes are exposed to a computer screen for a long time, it will do harm to your eyes. 这样能理解吗？

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