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
练习册系列答案
相关题目
题目内容
Some passengers were walking through one of the big halls at the airport ________ the whole roof fell down.
while
as soon as
when
after