题目内容

The roof fell ______ the PLA men had time to rescue the child trapped in the house.
A．untilB．unlessC．before D．because
C
fall 是短暂性动词，所以不能用until，此句意思应该是“解放军还没有救出被困在房子里的小孩，房顶就掉下来了。”所以答案C。
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