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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

B

解析试题分析: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。
考点:考查连词

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