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
网友回答
A. since
(答案→)B. before
C. until
D. while
解析：句意：过了几分钟我们才意识到发生了什么—我们的狗被新挖的隧道困住了。这里使用了句型：It was+一段时间+before…，“要多久…才/就…”,所以选B。