问题: 为什么选D不选C，怎么改
(Being)A the biggest expanse of branckish water (in the)B world, the Baltic Sea (is of)C special (interesting)D to scientists.
解答:
Being the biggest expanse of branckish water in the world, the Baltic Sea is of special interest to scientists.
is of + noun. 是 is adj. 的另一种表达法
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