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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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已经被冻住的水管怎么可能又洒很多水呢？只能是洒水系统才会洒水。所以D不对，因为D的逻辑主语两个半句都是“水管”
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