with the size of the whole earth the highest mountain does not seem high at all.A. Comp

问题补充：

with the size of the whole earth, the highest mountain does not seem high at all.

A. Compare

B. Comparing

C. When compared

D. When comparing

答案：

A. Compare

B. Comparing

(答案→)C. When compared

D. When comparing

解析：本题考查非谓语动词。句意为：与整个地球相比，世界上最高的山似乎一点也不高了。这是一个省略了的状语从句，完整的句子应是When it is compared with the size of...