1. 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 为什么不选E呢,the flood was gradual 和 it created a cataclysm都是两个完整的句子不能看作是平行么?
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