题目内容

It was several minutes _______ we realized what was happening~our dog was trapped in a newly-dug tunnel.
A．sinceB．beforeC．untilD．while
B

试题分析：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。
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