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Some passengers were walking through “one of the big halls at Paris” Charles De Gaulle Airport ________ the whole roof fell down.


  1. A.
    while
  2. B.
    as soon as
  3. C.
    when
  4. D.
    after
C
据句意及主从句的意义关系来确定连词的选用。据句意应选择“当……时候”的引导词,when引导的从句其谓语动词可以是延续或非延续性动词;while引导的从句其谓语动词只能是延续性动词。句中的“fell”为非延续性动词,故选C。
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