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【题目】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】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。

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