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Some passengers were walking through one of big halls at Pairs’ Charles De Caules Airport ________ the whole roof fell down.


  1. A.
    while
  2. B.
    as soon as
  3. C.
    when
  4. D.
    after
C
解析：
選項(xiàng)B和D表示的時(shí)間本身就說(shuō)明有先后關(guān)系，而例句強(qiáng)調(diào)的是主句和從句二者動(dòng)作同時(shí)發(fā)生。故先排除B和D，雖然可表示主從句二者動(dòng)作同時(shí)發(fā)生，但while側(cè)重的意思是“在……期間”，含有一個(gè)時(shí)間段，而例句則表示“就在這時(shí)”的意思，與just at that moment同義，因此用when更貼切。
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