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

问题补充：

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

A. Compare

B. Comparing

C. Compared

D. To compare

答案：

A. Compare

B. Comparing

(答案→)C. Compared

D. To compare

解析：考查非谓语动词。句意：与地球的整个大小相比，最大的海洋显得一点都不大。过去分词表示被动的动作，与句子主语是动宾关系，故选C。