The roof fell ______ the PLA men had time to rescue the child trapped in the hou
题型：不详难度：来源：
The roof fell ______ the PLA men had time to rescue the child trapped in the house.| A．until | B．unless | C．before | D．because |
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答案
| C |
解析
| 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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