【題目】It was several minutes we realized what was happening—our dog was trapped in a newlydug tunnel.

A. since B. before

C. until D. while

【答案】B

【解析】試題分析：句意：過(guò)了幾分鐘我們才意識(shí)到發(fā)生了什么—我們的狗被新挖的隧道困住了。這里使用了句型：It was+一段時(shí)間+before…，“要多久…才/就…”,所以選B。

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