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___________ 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

________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.   

_____ 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