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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

試題分析：句意：過了幾分鐘我們才意識到發生了什么—我們的狗被新挖的隧道困住了。這里使用了句型：It was+一段時間+before…，“要多久…才/就…”,所以選B。

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