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The roof fell ________ he had time to dash into the house to save his baby.


  1. A.
    as
  2. B.
    after
  3. C.
    until
  4. D.
    before
D
解析:
本題考查before引導(dǎo)的時(shí)間狀語(yǔ)從句,意為“在……之前”。句意為“他來(lái)不及沖進(jìn)去救他的孩子,屋頂就塌了”。
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