Scientists found that people need to stay outside for ______ two hours to have good eyesight. A.at l...
2022-09-12 16:52:00 39次 2019年山西省太原市中考一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Scientists found that people need to stay outside for ______ two hours to have good eyesight.
A.at least B.at once C.at last
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