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. When comparing

C. Comparing

D. When compared

答案：

A. Compare

B. When comparing

C. Comparing

(答案→)D. When compared

解析：分词的逻辑主语为“the biggest ocean”，它不能发出“compare”动作。从“compare A with B”的结构我们可以推断，它们之间存在逻辑上的被动关系，应用过去分词。如选B或C项，则就是“垂悬分词”。