扫描二维码，直接登录
题库 / OG2017V-SC-225
As a result of record low temperatures, the water pipes on the third floor froze, which caused the heads of the sprinkler system to burst, which released torrents of water into offices on the second floor.
which caused the heads of the sprinkler system to burst, which released torrents of water
which caused the heads of the sprinkler system to burst and which released torrents of water
which caused the heads of the sprinkler system to burst, torrents of water were then released
causing the heads of the sprinkler system to burst, then releasing torrents of water
causing the heads of the sprinkler system to burst and release torrents of water
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
A选项：第二个which用法不正确；
B选项：两个动作caused...和released...的关系是前者引起后者，而本题用and连接表示并列了；
C选项：两个句子之间仅仅用逗号隔开，不和语法；
D选项：同B选项的错误，本选项中结构默认the freezing of the water pipes是causing 和releasing的主语，而then把这两个事情分开，让两件事情有个先后顺序；
E选项：两个动词并列，表示同时发生；
登录 或 注册 后可以参加讨论