Some passengers were walking through one of the big halls at the airport the whole roof fell down． [ ] A． while B． as soon as C． when D． after 题目和参考答案——青夏教育精英家教网—

题目内容

Some passengers were walking through one of the big halls at the airport ________ the whole roof fell down．

[　　]

A．

while

B．

as soon as

C．

when

D．

after

答案：C

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