The roof fell ______ the PLA men had time to rescue the child trapped in the house.
A．untilB．unlessC．before D．because
C
fall 是短暫性動詞，所以不能用until，此句意思應該是“解放軍還沒有救出被困在房子里的小孩，房頂就掉下來了�！彼源鸢窩。
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