题目

_________ 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   答案： 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”。

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