________ with thesize of the whole earth, the highest mountain doesn’t seem high at all.

________ with thesize of the whole earth, the highest mountain doesn’t seem high at all.

A.Whencompared

B.To compare

C.Whilecomparing

D.Itcompared

答案及解析： A

解析：

过去分词作状语，mountain与compare是动宾关系。