问题
选择题
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
答案
答案：B
题目分析：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。