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A little under a million years ago, the briny waters of the Baltic Sea began flooding into the cold North Atlantic: geologists are still debating whether the flood was gradual or created a cataclysm (A) whether the flood was gradual or created a cataclysm (B) if the flood was gradual or created a cataclysm (C) about whether the flood was gradual or cataclysmic (D) whether the flood was gradual or cataclysmic（D） (E) whether the flood was gradual or it created a cataclysm debate about 不对吗？？or后面为什么不能加其他东西？ | 
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发表于 2009-1-31 11:39:00
