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Polar bears live mostly on______ sea ice, which they use as ______platform for hunting seals.

  A. a; a          B. a; the        C. 不填; a           D. the; 不填

C


解析:

考查冠詞的基本用法。第一空修飾的名詞ice為不可數,前面不加a,第二空根據句意“把海冰作為一個捕捉海豹的平臺”選C

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