_______ the boy was walking down the street, the UFO landed. A. While B. After C. Before D. until
2022-11-08 23:29:12 26次 河北省2016-2017学年八年级下学期期中考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
_______ the boy was walking down the street, the UFO landed.
A. While B. After C. Before D. until
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