Question

Having been attacked by terrorists, _____.

A．doctors came to their rescue

B．the tall building collapsed

C．an emergency measure was taken

D．warnings were given to tourists

Answer 1

B

解析试题分析：考查非谓语动词。非谓语动词要和主句共用一个主语。只有B的主语能被分词     使用。根据句意其它都不合适。句意：这座大楼被恐怖分子袭击后就倒塌了。根据句意说明B正确。
考点：考查非谓语动词。