with the size of the whole earth , the biggest ocean does not seem big at all .A. Compare

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A. Compare
B. When paring
C. Comparing
(答案→)D. When pared
解析：句意,和整个地球的大小相比较，最大的海洋看起来也根本不大了。主语“最大的海洋”与分词动作“比较”之间是一种被动关系，所以应该用过去分词作状语，根据需要，过去分词前面可加上when, while, until, once, though, although, as long as, so long as, unless, as if, as though, even if, even though等词，故选D。