SomepassengerswerewalkingthroughoneofthebighallsatParis...
問題詳情:
Some passengers were walking through one of the big halls at Paris' Charles De Gaulle Airport __ the whole roof(屋頂)fell down.
A. while B. as soon as C. when D. after
【回答】
C
解析:依據題結構,be doing sth…when…表示“正在……這時……”的意思。故選C。
知識點:連詞
題型:選擇題