_________ with the size of the whole earth, the highest mountain doesn't seem high at all.
A. When compared B. To compare
C. While comparing D. It compared
_________ with the size of the whole earth, the highest mountain doesn't seem high at all.
A. When compared B. To compare
C. While comparing D. It compared
A
本题考查省略的用法。分句和主句的主语一致，when引导分句的主语省略，原句应为“when the highest mountain is compared with the size of the whole earth”。