【题目】____ with the size of the whole earth, the highest mountain doesn’t seem high at all.
A. To compare B. while comparing
C. It comparing D. when compared
在线课程【答案】D
【解析】
试题分析：考查过去分词。过去分词作状语，mountain与compare是动宾关系。When compared 这道题是考语法中的省略.即当主句和从句的主语一致时从句的主语+be可省略.所以选,When compared=when (it is ) compared.故选D。