_______in the ocean, it bees powerless once it is on the beachA.However a whale is powerfulB.However powerful a whale isC.Whatever a powerful whale isD.Whatever powerful a whale is
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B解析考查让步状语从句。However修饰形容词或副词，Whatever修饰名词，排除A,D；且根据句意，应是不管鲸鱼在海里怎样强大，一旦到了海滩上它就变得没有力量了。However无论怎样，Whatever无论什么。所以选B。