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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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