问题
选择题
________ with the size of the whole earth, the biggest ocean does not seem big at all.
A．To compare
B．When comparing
C．Comparing
D．When compared
答案
答案：D
考察分词作状语用法。The biggest ocean与compare之间构成被动关系，使用过去分词。故D正确。可以认为在compared前面省略了it is.