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）。
语义理解很重要：which在这不能指代整个前面的句子，所以要用causing来表状态，是heads release the water，所以要和burst一起并列！！！
登录 或 注册 后可以参加讨论