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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
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为什么最后一个选项这里用release, 而不是released。 为什么第四个选项不对
因为和burst并列
then releasing 是错误的表示方法， 和 he was stuck in an car accident, then dying instantly 一样，“，ving”表示ing动词和前面的action同时发生， 不能加 then 矛盾 he was stuck in an car accident, dying instantly 正确。causing the heads of the sprinkler system to burst, releasing torrents of water 正确
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