The roof fell ______ the PLA men had time to rescue the child trapped in the house


  1. A.
    until
  2. B.
    unless
  3. C.
    before
  4. 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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