问题
选择题
_________ 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
答案：D
本题 考查省略句和非谓语动词。When compared是 When it is compared的省略，句子主语the biggest ocean和compare是被动关系，所以用过去分词。