It was several minutes ____we realized what was happening-our dog was trapped in a newly-dug tunnel....
2022-11-22 08:10:46 32次 2013-2014学年江苏省南京市盐城市高三第二次模拟（淮安三模）英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It was several minutes ____we realized what was happening-our dog was trapped in a newly-dug tunnel.
A. since B. before C. until D. while
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