◎ 题干
Some passengers were walking through one of the big halls at
De Gaulle Airport _____ the whole roof (屋顶) fell down.
[     ]
A. while
B. as soon as
C. when
D. after
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Some passengers were walking through one of the big halls at De Gaulle Airport _____ the whole roof (屋顶) fell down. [ ]A. while B. as soon as C. when D. a…”主要考查了你对  【从属连词】【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。