问题
选择题
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. after
答案
答案：C
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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：C